feat: Sign bounce messages

Closes #873

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>

.github/workflows/ci.yaml

@@ -14,7 +14,8 @@ jobs:
         # Otherwise `test_deployed_state` will be unhappy.
         with:
           ref: ${{ github.event.pull_request.head.sha }}
-
+      - name: download filtermail
+        run: curl -L https://github.com/chatmail/filtermail/releases/download/v0.6.1/filtermail-x86_64 -o /usr/local/bin/filtermail && chmod +x /usr/local/bin/filtermail
       - name: run chatmaild tests 
         working-directory: chatmaild
         run: pipx run tox

.github/workflows/test-and-deploy-ipv4only.yaml

@@ -71,25 +71,35 @@ jobs:
       - name: run deploy-chatmail offline tests 
         run: pytest --pyargs cmdeploy 
 
-      - run: |
-          cmdeploy init staging-ipv4.testrun.org
-          sed -i 's#disable_ipv6 = False#disable_ipv6 = True#' chatmail.ini
+      - name: setup dependencies
+        run: |
+          ssh root@staging-ipv4.testrun.org apt update
+          ssh root@staging-ipv4.testrun.org apt install -y git python3.11-venv python3-dev gcc
+          ssh root@staging-ipv4.testrun.org git clone https://github.com/chatmail/relay
+          ssh root@staging-ipv4.testrun.org "cd relay && git checkout " ${{ github.head_ref }}
+          ssh root@staging-ipv4.testrun.org "cd relay && scripts/initenv.sh"
 
-      - run: cmdeploy run --verbose --skip-dns-check
+      - name: initialize config
+        run: |
+          ssh root@staging-ipv4.testrun.org "cd relay && scripts/cmdeploy init staging-ipv4.testrun.org"
+          ssh root@staging-ipv4.testrun.org "sed -i 's#disable_ipv6 = False#disable_ipv6 = True#' relay/chatmail.ini"
+          ssh root@staging-ipv4.testrun.org "sed -i 's/#\s*mtail_address/mtail_address/' relay/chatmail.ini"
+          ssh root@staging-ipv4.testrun.org "sed -i 's/max_mailbox_size = 500M/max_mailbox_size = 10k/' relay/chatmail.ini"
+
+      - run: ssh root@staging-ipv4.testrun.org "cd relay && scripts/cmdeploy run --verbose --skip-dns-check --ssh-host localhost"
 
       - name: set DNS entries
         run: |
-          ssh -o StrictHostKeyChecking=accept-new -v root@staging-ipv4.testrun.org chown opendkim:opendkim -R /etc/dkimkeys
-          cmdeploy dns --zonefile staging-generated.zone
-          cat staging-generated.zone >> .github/workflows/staging-ipv4.testrun.org-default.zone
+          ssh root@staging-ipv4.testrun.org "cd relay && scripts/cmdeploy dns --zonefile staging-generated.zone --ssh-host localhost"
+          ssh root@staging-ipv4.testrun.org cat relay/staging-generated.zone >> .github/workflows/staging-ipv4.testrun.org-default.zone
           cat .github/workflows/staging-ipv4.testrun.org-default.zone
           scp .github/workflows/staging-ipv4.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging-ipv4.testrun.org.zone
           ssh root@ns.testrun.org nsd-checkzone staging-ipv4.testrun.org /etc/nsd/staging-ipv4.testrun.org.zone
           ssh root@ns.testrun.org systemctl reload nsd
 
       - name: cmdeploy test
-        run: CHATMAIL_DOMAIN2=ci-chatmail.testrun.org cmdeploy test --slow
+        run: ssh root@staging-ipv4.testrun.org "cd relay && CHATMAIL_DOMAIN2=ci-chatmail.testrun.org scripts/cmdeploy test --slow --ssh-host localhost"
 
       - name: cmdeploy dns
-        run: cmdeploy dns -v
+        run: ssh root@staging-ipv4.testrun.org "cd relay && scripts/cmdeploy dns -v --ssh-host localhost"
 

.github/workflows/test-and-deploy.yaml

@@ -74,13 +74,14 @@ jobs:
       - name: run deploy-chatmail offline tests 
         run: pytest --pyargs cmdeploy 
 
-      - run: cmdeploy init staging2.testrun.org
+      - run: |
+          cmdeploy init staging2.testrun.org
+          sed -i 's/#\s*mtail_address/mtail_address/;s/max_mailbox_size = 500M/max_mailbox_size = 10k/' chatmail.ini
 
       - run: cmdeploy run --verbose --skip-dns-check
 
       - name: set DNS entries
         run: |
-          ssh -o StrictHostKeyChecking=accept-new root@staging2.testrun.org chown opendkim:opendkim -R /etc/dkimkeys
           cmdeploy dns --zonefile staging-generated.zone --verbose
           cat staging-generated.zone >> .github/workflows/staging.testrun.org-default.zone
           cat .github/workflows/staging.testrun.org-default.zone

.gitignore

@@ -4,7 +4,7 @@ __pycache__/
 *$py.class
 *.swp
 *qr-*.png
-chatmail.ini
+chatmail*.ini
 
 
 # C extensions

.python-version

@@ -1 +0,0 @@
-3.11

README.md

@@ -1,43 +1,20 @@
-# سرور رله چت‌میل (Chatmail Relay)
 
-این پروژه برای راه‌اندازی سریع و آسان سرورهای رله **Chatmail** طراحی شده است. چت‌میل یک سیستم ایمیل امن و بهینه برای پیام‌رسان **Delta Chat** است که بر حفظ حریم خصوصی و سرعت بالا تمرکز دارد.
+# Chatmail relays for end-to-end encrypted email
 
-### ویژگی‌های کلیدی:
-- **بدون ذخیره‌سازی داده (Zero State):** پیام‌ها پس از تحویل حذف می‌شوند و هیچ متادیتای خصوصی ذخیره نخواهد شد.
-- **سرعت لحظه‌ای (Realtime):** تحویل پیام در کمتر از یک ثانیه و پشتیبانی از پوش‌نوتیفیکیشن‌های امن.
-- **امنیت سخت‌گیرانه:** استفاده اجباری از TLS، DKIM و OpenPGP.
-- **غیرمتمرکز و استاندارد:** بر اساس پروتکل‌های استاندارد IETF بدون نیاز به چک کردن IP یا اسپم.
+Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed for: 
 
----
+-  **Zero State:** no private data or metadata collected, messages are auto-deleted, low disk usage
 
-### شیوه‌ی نصب
+-  **Instant/Realtime:** sub-second message delivery, realtime P2P
+   streaming, privacy-preserving Push Notifications for Apple, Google, and Huawei;
 
-برای نصب سریع روی سرور لینوکس (توصیه شده: Debian یا Ubuntu)، می‌توانید از دستور زیر استفاده کنید:
+-  **Security Enforcement**: only strict TLS, DKIM and OpenPGP with minimized metadata accepted
 
-```bash
-curl https://raw.githubusercontent.com/omidz4t/relay-ir/refs/heads/main/init.sh | sudo bash
-```
+-  **Reliable Federation and Decentralization:** No spam or IP reputation checks, federating
+   depends on established IETF standards and protocols.
 
-**روش جایگزین (دانلود و اجرای دستی):**
-اگر مایل هستید فایل را ابتدا دانلود و سپس اجرا کنید:
+This repository contains everything needed to setup a ready-to-use chatmail relay on an ssh-reachable host. 
+For getting started and more information please refer to the web version of this repositories' documentation at
 
-```bash
-wget https://raw.githubusercontent.com/omidz4t/relay-ir/refs/heads/main/init.sh
-chmod +x init.sh
-sudo ./init.sh
-```
+[https://chatmail.at/doc/relay](https://chatmail.at/doc/relay)
 
----
-
-### اسکریپت `init.sh` چه کاری انجام می‌دهد؟
-
-اسکریپت `init.sh` تمام مراحل لازم برای آماده‌سازی سرور را به صورت خودکار انجام می‌دهد:
-
-1. **نصب وابستگی‌ها:** ابزارهای مورد نیاز مانند `git`, `curl`, `python3`, `gcc` و غیره را نصب می‌کند.
-2. **مدیریت محیط پایتون:** ابزار مدرن `uv` را برای مدیریت سریع و بهینه بسته‌ها و محیط مجازی (venv) نصب و پیکربندی می‌کند.
-3. **دریافت سورس‌کد:** آخرین نسخه پروژه را از گیت‌هاب دریافت می‌کند.
-4. **تنظیمات خودکار:** از شما نام دامنه و ایمیل (برای گواهی SSL) را می‌پرسد و فایل تنظیمات `chatmail.ini` را بر اساس استانداردهای بهینه ویرایش می‌کند (تنظیم حجم صندوق پستی، مدت زمان نگهداری پیام‌ها و غیره).
-5. **استقرار (Deployment):** در نهایت تمام سرویس‌های لازم (Postfix, Dovecot, Nginx و غیره) را به صورت خودکار نصب و فعال می‌کند.
-
----
-برای اطلاعات بیشتر و مستندات فنی دقیق‌تر به [مستندات اصلی](https://chatmail.at/doc/relay) مراجعه کنید.

chatmaild/pyproject.toml

@@ -6,10 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "chatmaild"
 version = "0.3"
 dependencies = [
-  "aiosmtpd",
   "iniconfig",
-  "deltachat-rpc-server",
-  "deltachat-rpc-client",
   "filelock",
   "requests",
   "crypt-r >= 3.13.1 ; python_version >= '3.11'",
@@ -24,8 +21,6 @@ where = ['src']
 [project.scripts]
 doveauth = "chatmaild.doveauth:main"
 chatmail-metadata = "chatmaild.metadata:main"
-filtermail = "chatmaild.filtermail:main"
-chatmail-metrics = "chatmaild.metrics:main"
 chatmail-expire = "chatmaild.expire:main"
 chatmail-fsreport = "chatmaild.fsreport:main"
 lastlogin = "chatmaild.lastlogin:main"
@@ -72,6 +67,7 @@ commands =
 deps = pytest 
        pdbpp 
        pytest-localserver
+       aiosmtpd
        execnet
 commands = pytest -v -rsXx {posargs}
 """

chatmaild/src/chatmaild/config.py

@@ -1,3 +1,4 @@
+import os
 from pathlib import Path
 
 import iniconfig
@@ -20,7 +21,8 @@ class Config:
     def __init__(self, inipath, params):
         self._inipath = inipath
         self.mail_domain = params["mail_domain"]
-        self.max_user_send_per_minute = int(params["max_user_send_per_minute"])
+        self.max_user_send_per_minute = int(params.get("max_user_send_per_minute", 60))
+        self.max_user_send_burst_size = int(params.get("max_user_send_burst_size", 10))
         self.max_mailbox_size = params["max_mailbox_size"]
         self.max_message_size = int(params.get("max_message_size", "31457280"))
         self.delete_mails_after = params["delete_mails_after"]
@@ -32,16 +34,19 @@ class Config:
         self.passthrough_senders = params["passthrough_senders"].split()
         self.passthrough_recipients = params["passthrough_recipients"].split()
         self.www_folder = params.get("www_folder", "")
-        self.filtermail_smtp_port = int(params["filtermail_smtp_port"])
+        self.filtermail_smtp_port = int(params.get("filtermail_smtp_port", "10080"))
         self.filtermail_smtp_port_incoming = int(
-            params["filtermail_smtp_port_incoming"]
+            params.get("filtermail_smtp_port_incoming", "10081")
         )
-        self.postfix_reinject_port = int(params["postfix_reinject_port"])
+        self.filtermail_http_port = int(params.get("filtermail_http_port", "10082"))
+        self.postfix_reinject_port = int(params.get("postfix_reinject_port", "10025"))
         self.postfix_reinject_port_incoming = int(
-            params["postfix_reinject_port_incoming"]
+            params.get("postfix_reinject_port_incoming", "10026")
         )
         self.mtail_address = params.get("mtail_address")
         self.disable_ipv6 = params.get("disable_ipv6", "false").lower() == "true"
+        self.addr_v4 = os.environ.get("CHATMAIL_ADDR_V4", "")
+        self.addr_v6 = os.environ.get("CHATMAIL_ADDR_V6", "")
         self.acme_email = params.get("acme_email", "")
         self.imap_rawlog = params.get("imap_rawlog", "false").lower() == "true"
         self.imap_compress = params.get("imap_compress", "false").lower() == "true"
@@ -56,6 +61,31 @@ class Config:
         self.privacy_pdo = params.get("privacy_pdo")
         self.privacy_supervisor = params.get("privacy_supervisor")
 
+        # TLS certificate management.
+        # If tls_external_cert_and_key is set, use externally managed certs.
+        # Otherwise derived from the domain name:
+        # - Domains starting with "_" use self-signed certificates
+        # - All other domains use ACME.
+        external = params.get("tls_external_cert_and_key", "").strip()
+
+        if external:
+            parts = external.split()
+            if len(parts) != 2:
+                raise ValueError(
+                    "tls_external_cert_and_key must have two space-separated"
+                    " paths: CERT_PATH KEY_PATH"
+                )
+            self.tls_cert_mode = "external"
+            self.tls_cert_path, self.tls_key_path = parts
+        elif self.mail_domain.startswith("_"):
+            self.tls_cert_mode = "self"
+            self.tls_cert_path = "/etc/ssl/certs/mailserver.pem"
+            self.tls_key_path = "/etc/ssl/private/mailserver.key"
+        else:
+            self.tls_cert_mode = "acme"
+            self.tls_cert_path = f"/var/lib/acme/live/{self.mail_domain}/fullchain"
+            self.tls_key_path = f"/var/lib/acme/live/{self.mail_domain}/privkey"
+
         # deprecated option
         mbdir = params.get("mailboxes_dir", f"/home/vmail/mail/{self.mail_domain}")
         self.mailboxes_dir = Path(mbdir.strip())

chatmaild/src/chatmaild/dictproxy.py

@@ -22,7 +22,7 @@ class DictProxy:
                 wfile.flush()
 
     def handle_dovecot_request(self, msg, transactions):
-        # see https://doc.dovecot.org/developer_manual/design/dict_protocol/#dovecot-dict-protocol
+        # see https://doc.dovecot.org/2.3/developer_manual/design/dict_protocol/#dovecot-dict-protocol
         short_command = msg[0]
         parts = msg[1:].split("\t")
 

chatmaild/src/chatmaild/doveauth.py

@@ -1,8 +1,11 @@
 import json
 import logging
 import os
+import re
 import sys
 
+import filelock
+
 try:
     import crypt_r
 except ImportError:
@@ -13,10 +16,11 @@ from .dictproxy import DictProxy
 from .migrate_db import migrate_from_db_to_maildir
 
 NOCREATE_FILE = "/etc/chatmail-nocreate"
+VALID_LOCALPART_RE = re.compile(r"^[a-z0-9._-]+$")
 
 
 def encrypt_password(password: str):
-    # https://doc.dovecot.org/configuration_manual/authentication/password_schemes/
+    # https://doc.dovecot.org/2.3/configuration_manual/authentication/password_schemes/
     passhash = crypt_r.crypt(password, crypt_r.METHOD_SHA512)
     return "{SHA512-CRYPT}" + passhash
 
@@ -52,6 +56,10 @@ def is_allowed_to_create(config: Config, user, cleartext_password) -> bool:
         )
         return False
 
+    if not VALID_LOCALPART_RE.match(localpart):
+        logging.warning("localpart %r contains invalid characters", localpart)
+        return False
+
     return True
 
 
@@ -140,8 +148,13 @@ class AuthDictProxy(DictProxy):
         if not is_allowed_to_create(self.config, addr, cleartext_password):
             return
 
-        user.set_password(encrypt_password(cleartext_password))
-        print(f"Created address: {addr}", file=sys.stderr)
+        lock = filelock.FileLock(str(user.password_path) + ".lock", timeout=5)
+        with lock:
+            userdata = user.get_userdb_dict()
+            if userdata:
+                return userdata
+            user.set_password(encrypt_password(cleartext_password))
+            print(f"Created address: {addr}", file=sys.stderr)
         return user.get_userdb_dict()
 
 

chatmaild/src/chatmaild/expire.py

@@ -144,7 +144,7 @@ class Expiry:
                 continue
             changed = True
         if changed:
-            self.remove_file("maildirsize")
+            self.remove_file(f"{mbox.basedir}/maildirsize")
 
     def get_summary(self):
         return (

chatmaild/src/chatmaild/filtermail.py

@@ -1,378 +0,0 @@
-#!/usr/bin/env python3
-import asyncio
-import base64
-import binascii
-import sys
-import time
-from email import policy
-from email.parser import BytesParser
-from email.utils import parseaddr
-from smtplib import SMTP as SMTPClient
-
-from aiosmtpd.controller import Controller
-from aiosmtpd.smtp import SMTP
-
-from .config import read_config
-
-ENCRYPTION_NEEDED_523 = "523 Encryption Needed: Invalid Unencrypted Mail"
-
-
-def check_openpgp_payload(payload: bytes):
-    """Checks the OpenPGP payload.
-
-    OpenPGP payload must consist only of PKESK and SKESK packets
-    terminated by a single SEIPD packet.
-
-    Returns True if OpenPGP payload is correct,
-    False otherwise.
-
-    May raise IndexError while trying to read OpenPGP packet header
-    if it is truncated.
-    """
-    i = 0
-    while i < len(payload):
-        # Only OpenPGP format is allowed.
-        if payload[i] & 0xC0 != 0xC0:
-            return False
-
-        packet_type_id = payload[i] & 0x3F
-        i += 1
-
-        while payload[i] >= 224 and payload[i] < 255:
-            # Partial body length.
-            partial_length = 1 << (payload[i] & 0x1F)
-            i += 1 + partial_length
-
-        if payload[i] < 192:
-            # One-octet length.
-            body_len = payload[i]
-            i += 1
-        elif payload[i] < 224:
-            # Two-octet length.
-            body_len = ((payload[i] - 192) << 8) + payload[i + 1] + 192
-            i += 2
-        elif payload[i] == 255:
-            # Five-octet length.
-            body_len = (
-                (payload[i + 1] << 24)
-                | (payload[i + 2] << 16)
-                | (payload[i + 3] << 8)
-                | payload[i + 4]
-            )
-            i += 5
-        else:
-            # Impossible, partial body length was processed above.
-            return False
-
-        i += body_len
-
-        if i == len(payload):
-            # Last packet should be
-            # Symmetrically Encrypted and Integrity Protected Data Packet (SEIPD)
-            #
-            # This is the only place where this function may return `True`.
-            return packet_type_id == 18
-        elif packet_type_id not in [1, 3]:
-            # All packets except the last one must be either
-            # Public-Key Encrypted Session Key Packet (PKESK)
-            # or
-            # Symmetric-Key Encrypted Session Key Packet (SKESK)
-            return False
-
-    return False
-
-
-def check_armored_payload(payload: str, outgoing: bool):
-    """Check the armored PGP message for invalid content.
-
-    :param payload: the armored PGP message
-    :param outgoing: whether the message is outgoing or incoming
-    :return: whether the message is a valid PGP message
-    """
-    prefix = "-----BEGIN PGP MESSAGE-----\r\n"
-    if not payload.startswith(prefix):
-        return False
-    payload = payload.removeprefix(prefix)
-
-    while payload.endswith("\r\n"):
-        payload = payload.removesuffix("\r\n")
-    suffix = "-----END PGP MESSAGE-----"
-    if not payload.endswith(suffix):
-        return False
-    payload = payload.removesuffix(suffix)
-
-    version_comment = "Version: "
-    if payload.startswith(version_comment):
-        if outgoing:  # Disallow comments in outgoing messages
-            return False
-        # Remove comments from incoming messages
-        payload = payload.partition("\r\n")[2]
-
-    while payload.startswith("\r\n"):
-        payload = payload.removeprefix("\r\n")
-
-    # Remove CRC24.
-    payload = payload.rpartition("=")[0]
-
-    try:
-        payload = base64.b64decode(payload)
-    except binascii.Error:
-        return False
-
-    try:
-        return check_openpgp_payload(payload)
-    except IndexError:
-        return False
-
-
-def is_securejoin(message):
-    if message.get("secure-join") not in ["vc-request", "vg-request"]:
-        return False
-    if not message.is_multipart():
-        return False
-    parts_count = 0
-    for part in message.iter_parts():
-        parts_count += 1
-        if parts_count > 1:
-            return False
-        if part.is_multipart():
-            return False
-        if part.get_content_type() != "text/plain":
-            return False
-
-        payload = part.get_payload().strip().lower()
-        if payload not in ("secure-join: vc-request", "secure-join: vg-request"):
-            return False
-    return True
-
-
-def check_encrypted(message, outgoing=True):
-    """Check that the message is an OpenPGP-encrypted message.
-
-    MIME structure of the message must correspond to <https://www.rfc-editor.org/rfc/rfc3156>.
-    """
-    if not message.is_multipart():
-        return False
-    if message.get_content_type() != "multipart/encrypted":
-        return False
-    parts_count = 0
-    for part in message.iter_parts():
-        # We explicitly check Content-Type of each part later,
-        # but this is to be absolutely sure `get_payload()` returns string and not list.
-        if part.is_multipart():
-            return False
-
-        if parts_count == 0:
-            if part.get_content_type() != "application/pgp-encrypted":
-                return False
-
-            payload = part.get_payload()
-            if payload.strip() != "Version: 1":
-                return False
-        elif parts_count == 1:
-            if part.get_content_type() != "application/octet-stream":
-                return False
-
-            if not check_armored_payload(part.get_payload(), outgoing=outgoing):
-                return False
-        else:
-            return False
-        parts_count += 1
-    return True
-
-
-async def asyncmain_beforequeue(config, mode):
-    if mode == "outgoing":
-        port = config.filtermail_smtp_port
-        handler = OutgoingBeforeQueueHandler(config)
-    else:
-        port = config.filtermail_smtp_port_incoming
-        handler = IncomingBeforeQueueHandler(config)
-    HackedController(
-        handler,
-        hostname="127.0.0.1",
-        port=port,
-        data_size_limit=config.max_message_size,
-    ).start()
-
-
-def recipient_matches_passthrough(recipient, passthrough_recipients):
-    for addr in passthrough_recipients:
-        if recipient == addr:
-            return True
-        if addr[0] == "@" and recipient.endswith(addr):
-            return True
-    return False
-
-
-class HackedController(Controller):
-    def factory(self):
-        return SMTPDiscardRCPTO_options(self.handler, **self.SMTP_kwargs)
-
-
-class SMTPDiscardRCPTO_options(SMTP):
-    def _getparams(self, params):
-        # Ignore RCPT TO parameters.
-        #
-        # Otherwise parameters such as `ORCPT=...`
-        # or `NOTIFY=DELAY,FAILURE` (generated by Stalwart)
-        # make aiosmtpd reject the message here:
-        # <https://github.com/aio-libs/aiosmtpd/blob/98f578389ae86e5345cc343fa4e5a17b21d9c96d/aiosmtpd/smtp.py#L1379-L1384>
-        return {}
-
-
-class OutgoingBeforeQueueHandler:
-    def __init__(self, config):
-        self.config = config
-        self.send_rate_limiter = SendRateLimiter()
-
-    async def handle_MAIL(self, server, session, envelope, address, mail_options):
-        log_info(f"handle_MAIL from {address}")
-        envelope.mail_from = address
-        max_sent = self.config.max_user_send_per_minute
-        if not self.send_rate_limiter.is_sending_allowed(address, max_sent):
-            return f"450 4.7.1: Too much mail from {address}"
-
-        parts = envelope.mail_from.split("@")
-        if len(parts) != 2:
-            return f"500 Invalid from address <{envelope.mail_from!r}>"
-
-        return "250 OK"
-
-    async def handle_DATA(self, server, session, envelope):
-        loop = asyncio.get_running_loop()
-        return await loop.run_in_executor(None, self.sync_handle_DATA, envelope)
-
-    def sync_handle_DATA(self, envelope):
-        log_info("handle_DATA before-queue")
-        error = self.check_DATA(envelope)
-        if error:
-            return error
-        log_info("re-injecting the mail that passed checks")
-        client = SMTPClient("localhost", self.config.postfix_reinject_port)
-        client.sendmail(
-            envelope.mail_from, envelope.rcpt_tos, envelope.original_content
-        )
-        return "250 OK"
-
-    def check_DATA(self, envelope):
-        """the central filtering function for e-mails."""
-        log_info(f"Processing DATA message from {envelope.mail_from}")
-
-        message = BytesParser(policy=policy.default).parsebytes(envelope.content)
-        mail_encrypted = check_encrypted(message, outgoing=True)
-
-        _, from_addr = parseaddr(message.get("from").strip())
-
-        if envelope.mail_from.lower() != from_addr.lower():
-            return f"500 Invalid FROM <{from_addr!r}> for <{envelope.mail_from!r}>"
-
-        if mail_encrypted or is_securejoin(message):
-            print("Outgoing: Filtering encrypted mail.", file=sys.stderr)
-            return
-
-        print("Outgoing: Filtering unencrypted mail.", file=sys.stderr)
-
-        if envelope.mail_from in self.config.passthrough_senders:
-            return
-
-        # allow self-sent Autocrypt Setup Message
-        if envelope.rcpt_tos == [from_addr]:
-            if message.get("subject") == "Autocrypt Setup Message":
-                if message.get_content_type() == "multipart/mixed":
-                    return
-
-        passthrough_recipients = self.config.passthrough_recipients
-
-        for recipient in envelope.rcpt_tos:
-            if recipient_matches_passthrough(recipient, passthrough_recipients):
-                continue
-
-            print("Rejected unencrypted mail.", file=sys.stderr)
-            return ENCRYPTION_NEEDED_523
-
-
-class IncomingBeforeQueueHandler:
-    def __init__(self, config):
-        self.config = config
-
-    async def handle_DATA(self, server, session, envelope):
-        loop = asyncio.get_running_loop()
-        return await loop.run_in_executor(None, self.sync_handle_DATA, envelope)
-
-    def sync_handle_DATA(self, envelope):
-        log_info("handle_DATA before-queue")
-        error = self.check_DATA(envelope)
-        if error:
-            return error
-        log_info("re-injecting the mail that passed checks")
-
-        client = SMTPClient(
-            "localhost",
-            self.config.postfix_reinject_port_incoming,
-        )
-        client.sendmail(
-            envelope.mail_from, envelope.rcpt_tos, envelope.original_content
-        )
-        return "250 OK"
-
-    def check_DATA(self, envelope):
-        """the central filtering function for e-mails."""
-        log_info(f"Processing DATA message from {envelope.mail_from}")
-
-        message = BytesParser(policy=policy.default).parsebytes(envelope.content)
-        mail_encrypted = check_encrypted(message, outgoing=False)
-
-        if mail_encrypted or is_securejoin(message):
-            print("Incoming: Filtering encrypted mail.", file=sys.stderr)
-            return
-
-        print("Incoming: Filtering unencrypted mail.", file=sys.stderr)
-
-        # we want cleartext mailer-daemon messages to pass through
-        # chatmail core will typically not display them as normal messages
-        if message.get("auto-submitted"):
-            _, from_addr = parseaddr(message.get("from").strip())
-            if from_addr.lower().startswith("mailer-daemon@"):
-                if message.get_content_type() == "multipart/report":
-                    return
-
-        for recipient in envelope.rcpt_tos:
-            user = self.config.get_user(recipient)
-            if user is None or user.is_incoming_cleartext_ok():
-                continue
-
-            print("Rejected unencrypted mail.", file=sys.stderr)
-            return ENCRYPTION_NEEDED_523
-
-
-class SendRateLimiter:
-    def __init__(self):
-        self.addr2timestamps = {}
-
-    def is_sending_allowed(self, mail_from, max_send_per_minute):
-        last = self.addr2timestamps.setdefault(mail_from, [])
-        now = time.time()
-        last[:] = [ts for ts in last if ts >= (now - 60)]
-        if len(last) <= max_send_per_minute:
-            last.append(now)
-            return True
-        return False
-
-
-def log_info(msg):
-    print(msg, file=sys.stderr)
-
-
-def main():
-    args = sys.argv[1:]
-    assert len(args) == 2
-    config = read_config(args[0])
-    mode = args[1]
-    loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
-    assert mode in ["incoming", "outgoing"]
-    task = asyncmain_beforequeue(config, mode)
-    loop.create_task(task)
-    log_info("entering serving loop")
-    loop.run_forever()

chatmaild/src/chatmaild/fsreport.py

@@ -13,9 +13,20 @@ to show storage summaries only for first 1000 mailboxes
 
     python -m chatmaild.fsreport /path/to/chatmail.ini --maxnum 1000
 
+to write Prometheus textfile for node_exporter
+
+    python -m chatmaild.fsreport --textfile /var/lib/prometheus/node-exporter/
+
+writes to /var/lib/prometheus/node-exporter/fsreport.prom
+
+to also write legacy metrics.py style output (default: /var/www/html/metrics):
+
+    python -m chatmaild.fsreport --textfile /var/lib/prometheus/node-exporter/ --legacy-metrics
+
 """
 
 import os
+import tempfile
 from argparse import ArgumentParser
 from datetime import datetime
 
@@ -48,7 +59,19 @@ class Report:
         self.num_ci_logins = self.num_all_logins = 0
         self.login_buckets = {x: 0 for x in (1, 10, 30, 40, 80, 100, 150)}
 
-        self.message_buckets = {x: 0 for x in (0, 160000, 500000, 2000000)}
+        KiB = 1024
+        MiB = 1024 * KiB
+        self.message_size_thresholds = (
+            0,
+            100 * KiB,
+            MiB // 2,
+            1 * MiB,
+            2 * MiB,
+            5 * MiB,
+            10 * MiB,
+        )
+        self.message_buckets = {x: 0 for x in self.message_size_thresholds}
+        self.message_count_buckets = {x: 0 for x in self.message_size_thresholds}
 
     def process_mailbox_stat(self, mailbox):
         # categorize login times
@@ -68,9 +91,10 @@ class Report:
             for size in self.message_buckets:
                 for msg in mailbox.messages:
                     if msg.size >= size:
-                        if self.mdir and not msg.relpath.startswith(self.mdir):
+                        if self.mdir and f"/{self.mdir}/" not in msg.path:
                             continue
                         self.message_buckets[size] += msg.size
+                        self.message_count_buckets[size] += 1
 
         self.size_messages += sum(entry.size for entry in mailbox.messages)
         self.size_extra += sum(entry.size for entry in mailbox.extrafiles)
@@ -93,9 +117,10 @@ class Report:
 
         pref = f"[{self.mdir}] " if self.mdir else ""
         for minsize, sumsize in self.message_buckets.items():
+            count = self.message_count_buckets[minsize]
             percent = (sumsize / all_messages * 100) if all_messages else 0
             print(
-                f"{pref}larger than {HSize(minsize)}: {HSize(sumsize)} ({percent:.2f}%)"
+                f"{pref}larger than {HSize(minsize)}: {HSize(sumsize)} ({percent:.2f}%), {count} msgs"
             )
 
         user_logins = self.num_all_logins - self.num_ci_logins
@@ -111,6 +136,75 @@ class Report:
         for days, active in self.login_buckets.items():
             print(f"last {days:3} days: {HSize(active)} {p(active)}")
 
+    def _write_atomic(self, filepath, content):
+        """Atomically write content to filepath via tmp+rename."""
+        dirpath = os.path.dirname(os.path.abspath(filepath))
+        fd, tmppath = tempfile.mkstemp(dir=dirpath, suffix=".tmp")
+        try:
+            with os.fdopen(fd, "w") as f:
+                f.write(content)
+            os.chmod(tmppath, 0o644)
+            os.rename(tmppath, filepath)
+        except BaseException:
+            try:
+                os.unlink(tmppath)
+            except OSError:
+                pass
+            raise
+
+    def dump_textfile(self, filepath):
+        """Dump metrics in Prometheus exposition format."""
+        lines = []
+
+        lines.append("# HELP chatmail_storage_bytes Mailbox storage in bytes.")
+        lines.append("# TYPE chatmail_storage_bytes gauge")
+        lines.append(f'chatmail_storage_bytes{{kind="messages"}} {self.size_messages}')
+        lines.append(f'chatmail_storage_bytes{{kind="extra"}} {self.size_extra}')
+        total = self.size_extra + self.size_messages
+        lines.append(f'chatmail_storage_bytes{{kind="total"}} {total}')
+
+        lines.append("# HELP chatmail_messages_bytes Sum of msg bytes >= threshold.")
+        lines.append("# TYPE chatmail_messages_bytes gauge")
+        for minsize, sumsize in self.message_buckets.items():
+            lines.append(f'chatmail_messages_bytes{{min_size="{minsize}"}} {sumsize}')
+
+        lines.append("# HELP chatmail_messages_count Number of msgs >= size threshold.")
+        lines.append("# TYPE chatmail_messages_count gauge")
+        for minsize, count in self.message_count_buckets.items():
+            lines.append(f'chatmail_messages_count{{min_size="{minsize}"}} {count}')
+
+        lines.append("# HELP chatmail_accounts Number of accounts.")
+        lines.append("# TYPE chatmail_accounts gauge")
+        user_logins = self.num_all_logins - self.num_ci_logins
+        lines.append(f'chatmail_accounts{{kind="all"}} {self.num_all_logins}')
+        lines.append(f'chatmail_accounts{{kind="ci"}} {self.num_ci_logins}')
+        lines.append(f'chatmail_accounts{{kind="user"}} {user_logins}')
+
+        lines.append(
+            "# HELP chatmail_accounts_active Non-CI accounts active within N days."
+        )
+        lines.append("# TYPE chatmail_accounts_active gauge")
+        for days, active in self.login_buckets.items():
+            lines.append(f'chatmail_accounts_active{{days="{days}"}} {active}')
+
+        self._write_atomic(filepath, "\n".join(lines) + "\n")
+
+    def dump_compat_textfile(self, filepath):
+        """Dump legacy metrics.py style metrics."""
+        user_logins = self.num_all_logins - self.num_ci_logins
+        lines = [
+            "# HELP total number of accounts",
+            "# TYPE accounts gauge",
+            f"accounts {self.num_all_logins}",
+            "# HELP number of CI accounts",
+            "# TYPE ci_accounts gauge",
+            f"ci_accounts {self.num_ci_logins}",
+            "# HELP number of non-CI accounts",
+            "# TYPE nonci_accounts gauge",
+            f"nonci_accounts {user_logins}",
+        ]
+        self._write_atomic(filepath, "\n".join(lines) + "\n")
+
 
 def main(args=None):
     """Report about filesystem storage usage of all mailboxes and messages"""
@@ -127,19 +221,21 @@ def main(args=None):
         "--days",
         default=0,
         action="store",
-        help="assume date to be days older than now",
+        help="assume date to be DAYS older than now",
     )
     parser.add_argument(
         "--min-login-age",
         default=0,
+        metavar="DAYS",
         dest="min_login_age",
         action="store",
-        help="only sum up message size if last login is at least min-login-age days old",
+        help="only sum up message size if last login is at least DAYS days old",
     )
     parser.add_argument(
         "--mdir",
+        metavar="{cur,new,tmp}",
         action="store",
-        help="only consider 'cur' or 'new' or 'tmp' messages for summary",
+        help="only consider messages in specified Maildir subdirectory for summary",
     )
 
     parser.add_argument(
@@ -148,6 +244,21 @@ def main(args=None):
         action="store",
         help="maximum number of mailboxes to iterate on",
     )
+    parser.add_argument(
+        "--textfile",
+        metavar="PATH",
+        default=None,
+        help="write Prometheus textfile to PATH (directory or file); "
+        "if PATH is a directory, writes 'fsreport.prom' inside it",
+    )
+    parser.add_argument(
+        "--legacy-metrics",
+        metavar="FILENAME",
+        nargs="?",
+        const="/var/www/html/metrics",
+        default=None,
+        help="write legacy metrics.py textfile (default: /var/www/html/metrics)",
+    )
 
     args = parser.parse_args(args)
 
@@ -161,7 +272,15 @@ def main(args=None):
     rep = Report(now=now, min_login_age=int(args.min_login_age), mdir=args.mdir)
     for mbox in iter_mailboxes(str(config.mailboxes_dir), maxnum=maxnum):
         rep.process_mailbox_stat(mbox)
-    rep.dump_summary()
+    if args.textfile:
+        path = args.textfile
+        if os.path.isdir(path):
+            path = os.path.join(path, "fsreport.prom")
+        rep.dump_textfile(path)
+    if args.legacy_metrics:
+        rep.dump_compat_textfile(args.legacy_metrics)
+    if not args.textfile and not args.legacy_metrics:
+        rep.dump_summary()
 
 
 if __name__ == "__main__":

chatmaild/src/chatmaild/ini/chatmail.ini.f

@@ -11,9 +11,12 @@ mail_domain = {mail_domain}
 # Restrictions on user addresses
 #
 
-# how many mails a user can send out per minute
+# email sending rate per user and minute
 max_user_send_per_minute = 60
 
+# per-user max burst size for sending rate limiting (GCRA bucket capacity)
+max_user_send_burst_size = 10
+
 # maximum mailbox size of a chatmail address
 max_mailbox_size = 500M
 
@@ -45,6 +48,13 @@ passthrough_senders =
 # (space-separated, item may start with "@" to whitelist whole recipient domains)
 passthrough_recipients =
 
+# Use externally managed TLS certificates instead of built-in acmetool.
+# Paths refer to files on the deployment server (not the build machine).
+# Both files must already exist before running cmdeploy.
+# Certificate renewal is your responsibility; changed files are
+# picked up automatically by all relay services.
+# tls_external_cert_and_key = /path/to/fullchain.pem /path/to/privkey.pem
+
 # path to www directory - documented here: https://chatmail.at/doc/relay/getting_started.html#custom-web-pages
 #www_folder = www
 

chatmaild/src/chatmaild/metadata.py

@@ -101,7 +101,11 @@ class MetadataDictProxy(DictProxy):
                 # Handle `GETMETADATA "" /shared/vendor/deltachat/irohrelay`
                 return f"O{self.iroh_relay}\n"
             elif keyname == "vendor/vendor.dovecot/pvt/server/vendor/deltachat/turn":
-                res = turn_credentials()
+                try:
+                    res = turn_credentials()
+                except Exception:
+                    logging.exception("failed to get TURN credentials")
+                    return "N\n"
                 port = 3478
                 return f"O{self.turn_hostname}:{port}:{res}\n"
 

chatmaild/src/chatmaild/metrics.py

@@ -1,32 +0,0 @@
-#!/usr/bin/env python3
-import sys
-from pathlib import Path
-
-
-def main(vmail_dir=None):
-    if vmail_dir is None:
-        vmail_dir = sys.argv[1]
-
-    accounts = 0
-    ci_accounts = 0
-
-    for path in Path(vmail_dir).iterdir():
-        if not path.joinpath("cur").is_dir():
-            continue
-        accounts += 1
-        if path.name[:3] in ("ci-", "ac_"):
-            ci_accounts += 1
-
-    print("# HELP total number of accounts")
-    print("# TYPE accounts gauge")
-    print(f"accounts {accounts}")
-    print("# HELP number of CI accounts")
-    print("# TYPE ci_accounts gauge")
-    print(f"ci_accounts {ci_accounts}")
-    print("# HELP number of non-CI accounts")
-    print("# TYPE nonci_accounts gauge")
-    print(f"nonci_accounts {accounts - ci_accounts}")
-
-
-if __name__ == "__main__":
-    main()

chatmaild/src/chatmaild/newemail.py

@@ -3,9 +3,9 @@
 """CGI script for creating new accounts."""
 
 import json
-import random
 import secrets
 import string
+from urllib.parse import quote
 
 from chatmaild.config import Config, read_config
 
@@ -15,7 +15,9 @@ ALPHANUMERIC_PUNCT = string.ascii_letters + string.digits + string.punctuation
 
 
 def create_newemail_dict(config: Config):
-    user = "".join(random.choices(ALPHANUMERIC, k=config.username_max_length))
+    user = "".join(
+        secrets.choice(ALPHANUMERIC) for _ in range(config.username_max_length)
+    )
     password = "".join(
         secrets.choice(ALPHANUMERIC_PUNCT)
         for _ in range(config.password_min_length + 3)
@@ -23,13 +25,26 @@ def create_newemail_dict(config: Config):
     return dict(email=f"{user}@{config.mail_domain}", password=f"{password}")
 
 
+def create_dclogin_url(email, password):
+    """Build a dclogin: URL with credentials and self-signed cert acceptance.
+
+    Uses ic=3 (AcceptInvalidCertificates) so chatmail clients
+    can connect to servers with self-signed TLS certificates.
+    """
+    return f"dclogin:{quote(email, safe='@')}?p={quote(password, safe='')}&v=1&ic=3"
+
+
 def print_new_account():
     config = read_config(CONFIG_PATH)
     creds = create_newemail_dict(config)
 
+    result = dict(email=creds["email"], password=creds["password"])
+    if config.tls_cert_mode == "self":
+        result["dclogin_url"] = create_dclogin_url(creds["email"], creds["password"])
+
     print("Content-Type: application/json")
     print("")
-    print(json.dumps(creds))
+    print(json.dumps(result))
 
 
 if __name__ == "__main__":

chatmaild/src/chatmaild/tests/test_config.py

@@ -73,3 +73,51 @@ def test_config_userstate_paths(make_config, tmp_path):
 def test_config_max_message_size(make_config, tmp_path):
     config = make_config("something.testrun.org", dict(max_message_size="10000"))
     assert config.max_message_size == 10000
+
+
+def test_config_tls_default_acme(make_config):
+    config = make_config("chat.example.org")
+    assert config.tls_cert_mode == "acme"
+    assert config.tls_cert_path == "/var/lib/acme/live/chat.example.org/fullchain"
+    assert config.tls_key_path == "/var/lib/acme/live/chat.example.org/privkey"
+
+
+def test_config_tls_self(make_config):
+    config = make_config("_test.example.org")
+    assert config.tls_cert_mode == "self"
+    assert config.tls_cert_path == "/etc/ssl/certs/mailserver.pem"
+    assert config.tls_key_path == "/etc/ssl/private/mailserver.key"
+
+
+def test_config_tls_external(make_config):
+    config = make_config(
+        "chat.example.org",
+        {
+            "tls_external_cert_and_key": "/custom/fullchain.pem /custom/privkey.pem",
+        },
+    )
+    assert config.tls_cert_mode == "external"
+    assert config.tls_cert_path == "/custom/fullchain.pem"
+    assert config.tls_key_path == "/custom/privkey.pem"
+
+
+def test_config_tls_external_overrides_underscore(make_config):
+    config = make_config(
+        "_test.example.org",
+        {
+            "tls_external_cert_and_key": "/certs/fullchain.pem /certs/privkey.pem",
+        },
+    )
+    assert config.tls_cert_mode == "external"
+    assert config.tls_cert_path == "/certs/fullchain.pem"
+    assert config.tls_key_path == "/certs/privkey.pem"
+
+
+def test_config_tls_external_bad_format(make_config):
+    with pytest.raises(ValueError, match="two space-separated"):
+        make_config(
+            "chat.example.org",
+            {
+                "tls_external_cert_and_key": "/only/one/path.pem",
+            },
+        )

chatmaild/src/chatmaild/tests/test_doveauth.py

@@ -120,6 +120,60 @@ def test_handle_dovecot_protocol_iterate(gencreds, example_config):
     assert not lines[2]
 
 
+def test_invalid_localpart_characters(make_config):
+    """Test that is_allowed_to_create rejects localparts with invalid characters."""
+    config = make_config("chat.example.org", {"username_min_length": "3"})
+    password = "zequ0Aimuchoodaechik"
+    domain = config.mail_domain
+
+    # valid localparts
+    assert is_allowed_to_create(config, f"abc123@{domain}", password)
+    assert is_allowed_to_create(config, f"a.b-c_d@{domain}", password)
+
+    # uppercase rejected
+    assert not is_allowed_to_create(config, f"Abc123@{domain}", password)
+    assert not is_allowed_to_create(config, f"ABCDEFG@{domain}", password)
+
+    # spaces and special chars rejected
+    assert not is_allowed_to_create(config, f"a b cde@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc+def@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc!def@{domain}", password)
+    assert not is_allowed_to_create(config, f"ab@cdef@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc/def@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc\\def@{domain}", password)
+
+
+def test_concurrent_creation_same_account(dictproxy):
+    """Test that concurrent creation of the same account doesn't corrupt password."""
+    addr = "racetest1@chat.example.org"
+    password = "zequ0Aimuchoodaechik"
+    num_threads = 10
+    results = queue.Queue()
+
+    def create():
+        try:
+            res = dictproxy.lookup_passdb(addr, password)
+            results.put(("ok", res))
+        except Exception:
+            results.put(("err", traceback.format_exc()))
+
+    threads = [threading.Thread(target=create, daemon=True) for _ in range(num_threads)]
+    for t in threads:
+        t.start()
+    for t in threads:
+        t.join(timeout=10)
+
+    passwords_seen = set()
+    for _ in range(num_threads):
+        status, res = results.get()
+        if status == "err":
+            pytest.fail(f"concurrent creation failed\n{res}")
+        passwords_seen.add(res["password"])
+
+    # all threads must see the same password hash
+    assert len(passwords_seen) == 1
+
+
 def test_50_concurrent_lookups_different_accounts(gencreds, dictproxy):
     num_threads = 50
     req_per_thread = 5

chatmaild/src/chatmaild/tests/test_expire.py

@@ -112,6 +112,43 @@ def test_report(mbox1, example_config):
     report_main(args)
 
 
+def test_report_mdir_filters_by_path(mbox1, example_config):
+    """Test that Report with mdir='cur' only counts messages in cur/ subdirectory."""
+    from chatmaild.fsreport import Report
+
+    now = datetime.utcnow().timestamp()
+
+    # Set password mtime to old enough so min_login_age check passes
+    password = Path(mbox1.basedir).joinpath("password")
+    old_time = now - 86400 * 10  # 10 days ago
+    os.utime(password, (old_time, old_time))
+
+    # Reload mailbox with updated mtime
+    from chatmaild.expire import MailboxStat
+
+    mbox = MailboxStat(mbox1.basedir)
+
+    # Report without mdir — should count all messages
+    rep_all = Report(now=now, min_login_age=1, mdir=None)
+    rep_all.process_mailbox_stat(mbox)
+    total_all = rep_all.message_buckets[0]
+
+    # Report with mdir='cur' — should only count cur/ messages
+    rep_cur = Report(now=now, min_login_age=1, mdir="cur")
+    rep_cur.process_mailbox_stat(mbox)
+    total_cur = rep_cur.message_buckets[0]
+
+    # Report with mdir='new' — should only count new/ messages
+    rep_new = Report(now=now, min_login_age=1, mdir="new")
+    rep_new.process_mailbox_stat(mbox)
+    total_new = rep_new.message_buckets[0]
+
+    # cur has 500-byte msg, new has 600-byte msg (from fill_mbox)
+    assert total_cur == 500
+    assert total_new == 600
+    assert total_all == 500 + 600
+
+
 def test_expiry_cli_basic(example_config, mbox1):
     args = (str(example_config._inipath),)
     expiry_main(args)

chatmaild/src/chatmaild/tests/test_filtermail.py

@@ -1,361 +0,0 @@
-import pytest
-
-from chatmaild.filtermail import (
-    IncomingBeforeQueueHandler,
-    OutgoingBeforeQueueHandler,
-    SendRateLimiter,
-    check_armored_payload,
-    check_encrypted,
-    is_securejoin,
-)
-
-
-@pytest.fixture
-def maildomain():
-    # let's not depend on a real chatmail instance for the offline tests below
-    return "chatmail.example.org"
-
-
-@pytest.fixture
-def handler(make_config, maildomain):
-    config = make_config(maildomain)
-    return OutgoingBeforeQueueHandler(config)
-
-
-@pytest.fixture
-def inhandler(make_config, maildomain):
-    config = make_config(maildomain)
-    return IncomingBeforeQueueHandler(config)
-
-
-def test_reject_forged_from(maildata, gencreds, handler):
-    class env:
-        mail_from = gencreds()[0]
-        rcpt_tos = [gencreds()[0]]
-
-    # test that the filter lets good mail through
-    to_addr = gencreds()[0]
-    env.content = maildata(
-        "encrypted.eml", from_addr=env.mail_from, to_addr=to_addr
-    ).as_bytes()
-
-    assert not handler.check_DATA(envelope=env)
-
-    # test that the filter rejects forged mail
-    env.content = maildata(
-        "encrypted.eml", from_addr="forged@c3.testrun.org", to_addr=to_addr
-    ).as_bytes()
-    error = handler.check_DATA(envelope=env)
-    assert "500" in error
-
-
-def test_filtermail_no_encryption_detection(maildata):
-    msg = maildata(
-        "plain.eml", from_addr="some@example.org", to_addr="other@example.org"
-    )
-    assert not check_encrypted(msg)
-
-    # https://xkcd.com/1181/
-    msg = maildata(
-        "fake-encrypted.eml", from_addr="some@example.org", to_addr="other@example.org"
-    )
-    assert not check_encrypted(msg)
-
-
-def test_filtermail_securejoin_detection(maildata):
-    msg = maildata(
-        "securejoin-vc.eml", from_addr="some@example.org", to_addr="other@example.org"
-    )
-    assert is_securejoin(msg)
-
-    msg = maildata(
-        "securejoin-vc-fake.eml",
-        from_addr="some@example.org",
-        to_addr="other@example.org",
-    )
-    assert not is_securejoin(msg)
-
-
-def test_filtermail_encryption_detection(maildata):
-    msg = maildata(
-        "encrypted.eml",
-        from_addr="1@example.org",
-        to_addr="2@example.org",
-        subject="Subject does not matter, will be replaced anyway",
-    )
-    assert check_encrypted(msg)
-
-
-def test_filtermail_no_literal_packets(maildata):
-    """Test that literal OpenPGP packet is not considered an encrypted mail."""
-    msg = maildata("literal.eml", from_addr="1@example.org", to_addr="2@example.org")
-    assert not check_encrypted(msg)
-
-
-def test_filtermail_unencrypted_mdn(maildata, gencreds):
-    """Unencrypted MDNs should not pass."""
-    from_addr = gencreds()[0]
-    to_addr = gencreds()[0] + ".other"
-    msg = maildata("mdn.eml", from_addr=from_addr, to_addr=to_addr)
-
-    assert not check_encrypted(msg)
-
-
-def test_send_rate_limiter():
-    limiter = SendRateLimiter()
-    for i in range(100):
-        if limiter.is_sending_allowed("some@example.org", 10):
-            if i <= 10:
-                continue
-            pytest.fail("limiter didn't work")
-        else:
-            assert i == 11
-            break
-
-
-def test_cleartext_excempt_privacy(maildata, gencreds, handler):
-    from_addr = gencreds()[0]
-    to_addr = "privacy@testrun.org"
-    handler.config.passthrough_recipients = [to_addr]
-    false_to = "privacy@something.org"
-
-    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
-
-    class env:
-        mail_from = from_addr
-        rcpt_tos = [to_addr]
-        content = msg.as_bytes()
-
-    # assert that None/no error is returned
-    assert not handler.check_DATA(envelope=env)
-
-    class env2:
-        mail_from = from_addr
-        rcpt_tos = [to_addr, false_to]
-        content = msg.as_bytes()
-
-    assert "523" in handler.check_DATA(envelope=env2)
-
-
-def test_cleartext_self_send_autocrypt_setup_message(maildata, gencreds, handler):
-    from_addr = gencreds()[0]
-    to_addr = from_addr
-
-    msg = maildata("asm.eml", from_addr=from_addr, to_addr=to_addr)
-
-    class env:
-        mail_from = from_addr
-        rcpt_tos = [to_addr]
-        content = msg.as_bytes()
-
-    assert not handler.check_DATA(envelope=env)
-
-
-def test_cleartext_send_fails(maildata, gencreds, handler):
-    from_addr = gencreds()[0]
-    to_addr = gencreds()[0]
-
-    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
-
-    class env:
-        mail_from = from_addr
-        rcpt_tos = [to_addr]
-        content = msg.as_bytes()
-
-    res = handler.check_DATA(envelope=env)
-    assert "523 Encryption Needed" in res
-
-
-def test_cleartext_incoming_fails(maildata, gencreds, inhandler):
-    from_addr = gencreds()[0]
-    to_addr, password = gencreds()
-
-    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
-
-    class env:
-        mail_from = from_addr
-        rcpt_tos = [to_addr]
-        content = msg.as_bytes()
-
-    user = inhandler.config.get_user(to_addr)
-    user.set_password(password)
-    res = inhandler.check_DATA(envelope=env)
-    assert "523 Encryption Needed" in res
-
-    user.allow_incoming_cleartext()
-    assert not inhandler.check_DATA(envelope=env)
-
-
-def test_cleartext_incoming_mailer_daemon(maildata, gencreds, inhandler):
-    from_addr = "mailer-daemon@example.org"
-    to_addr = gencreds()[0]
-
-    msg = maildata("mailer-daemon.eml", from_addr=from_addr, to_addr=to_addr)
-
-    class env:
-        mail_from = from_addr
-        rcpt_tos = [to_addr]
-        content = msg.as_bytes()
-
-    assert not inhandler.check_DATA(envelope=env)
-
-
-def test_cleartext_passthrough_domains(maildata, gencreds, handler):
-    from_addr = gencreds()[0]
-    to_addr = "privacy@x.y.z"
-    handler.config.passthrough_recipients = ["@x.y.z"]
-    false_to = "something@x.y"
-
-    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
-
-    class env:
-        mail_from = from_addr
-        rcpt_tos = [to_addr]
-        content = msg.as_bytes()
-
-    # assert that None/no error is returned
-    assert not handler.check_DATA(envelope=env)
-
-    class env2:
-        mail_from = from_addr
-        rcpt_tos = [to_addr, false_to]
-        content = msg.as_bytes()
-
-    assert "523" in handler.check_DATA(envelope=env2)
-
-
-def test_cleartext_passthrough_senders(gencreds, handler, maildata):
-    acc1 = gencreds()[0]
-    to_addr = "recipient@something.org"
-    handler.config.passthrough_senders = [acc1]
-
-    msg = maildata("plain.eml", from_addr=acc1, to_addr=to_addr)
-
-    class env:
-        mail_from = acc1
-        rcpt_tos = to_addr
-        content = msg.as_bytes()
-
-    # assert that None/no error is returned
-    assert not handler.check_DATA(envelope=env)
-
-
-def test_check_armored_payload():
-    prefix = "-----BEGIN PGP MESSAGE-----\r\n"
-    comment = "Version: ProtonMail\r\n"
-    payload = """\r
-wU4DSqFx0d1yqAoSAQdAYkX/ZN/Az4B0k7X47zKyWrXxlDEdS3WOy0Yf2+GJTFgg\r
-Zk5ql0mLG8Ze+ZifCS0XMO4otlemSyJ0K1ZPdFMGzUDBTgNqzkFabxXoXRIBB0AM\r
-755wlX41X6Ay3KhnwBq7yEqSykVH6F3x11iHPKraLCAGZoaS8bKKNy/zg5slda1X\r
-pt14b4aC1VwtSnYhcRRELNLD/wE2TFif+g7poMmFY50VyMPLYjVP96Z5QCT4+z4H\r
-Ikh/pRRN8S3JNMrRJHc6prooSJmLcx47Y5un7VFy390MsJ+LiUJuQMDdYWRAinfs\r
-Ebm89Ezjm7F03qbFPXE0X4ZNzVXS/eKO0uhJQdiov/vmbn41rNtHmNpqjaO0vi5+\r
-sS9tR7yDUrIXiCUCN78eBLVioxtktsPZm5cDORbQWzv+7nmCEz9/JowCUcBVdCGn\r
-1ofOaH82JCAX/cRx08pLaDNj6iolVBsi56Dd+2bGxJOZOG2AMcEyz0pXY0dOAJCD\r
-iUThcQeGIdRnU3j8UBcnIEsjLu2+C+rrwMZQESMWKnJ0rnqTk0pK5kXScr6F/L0L\r
-UE49ccIexNm3xZvYr5drszr6wz3Tv5fdue87P4etBt90gF/Vzknck+g1LLlkzZkp\r
-d8dI0k2tOSPjUbDPnSy1x+X73WGpPZmj0kWT+RGvq0nH6UkJj3AQTG2qf1T8jK+3\r
-rTp3LR9vDkMwDjX4R8SA9c0wdnUzzr79OYQC9lTnzcx+fM6BBmgQ2GrS33jaFLp7\r
-L6/DFpCl5zhnPjM/2dKvMkw/Kd6XS/vjwsO405FQdjSDiQEEAZA+ZvAfcjdccbbU\r
-yCO+x0QNdeBsufDVnh3xvzuWy4CICdTQT4s1AWRPCzjOj+SGmx5WqCLWfsd8Ma0+\r
-w/C7SfTYu1FDQILLM+llpq1M/9GPley4QZ8JQjo262AyPXsPF/OW48uuZz0Db1xT\r
-Yh4iHBztj4VSdy7l2+IyaIf7cnL4EEBFxv/MwmVDXvDlxyvfAfIsd3D9SvJESzKZ\r
-VWDYwaocgeCN+ojKu1p885lu1EfRbX3fr3YO02K5/c2JYDkc0Py0W3wUP/J1XUax\r
-pbKpzwlkxEgtmzsGqsOfMJqBV3TNDrOA2uBsa+uBqP5MGYLZ49S/4v/bW9I01Cr1\r
-D2ZkV510Y1Vgo66WlP8mRqOTyt/5WRhPD+MxXdk67BNN/PmO6tMlVoJDuk+XwWPR\r
-t2TvNaND/yabT9eYI55Og4fzKD6RIjouUX8DvKLkm+7aXxVs2uuLQ3Jco3O82z55\r
-dbShU1jYsrw9oouXUz06MHPbkdhNbF/2hfhZ2qA31sNeovJw65iUv7sDKX3LVWgJ\r
-10jlywcDwqlU8CO7WC9lGixYTbnOkYZpXCGEl8e6Jbs79l42YFo4ogYpFK1NXFhV\r
-kOXRmDf/wmfj+c/ld3L2PkvwlgofhCudOQknZbo3ub1gjiTn7L+lMGHIj/3suMIl\r
-ID4EUxAXScIM1ZEz2fjtW5jATlqYcLjLTbf/olw6HFyPNH+9IssqXeZNKnGwPUB9\r
-3lTXsg0tpzl+x7F/2WjEw1DSNhjC0KnHt1vEYNMkUGDGFdN9y3ERLqX/FIgiASUb\r
-bTvAVupnAK3raBezGmhrs6LsQtLS9P0VvQiLU3uDhMqw8Z4SISLpcD+NnVBHzQqm\r
-6W5Qn/8xsCL6av18yUVTi2G3igt3QCNoYx9evt2ZcIkNoyyagUVjfZe5GHXh8Dnz\r
-GaBXW/hg3HlXLRGaQu4RYCzBMJILcO25OhZOg6jbkCLiEexQlm2e9krB5cXR49Al\r
-UN4fiB0KR9JyG2ayUdNJVkXZSZLnHyRgiaadlpUo16LVvw==\r
-=b5Kp\r
------END PGP MESSAGE-----\r
-\r
-\r
-"""
-
-    commented_payload = prefix + comment + payload
-    assert check_armored_payload(commented_payload, outgoing=False) == True
-    assert check_armored_payload(commented_payload, outgoing=True) == False
-
-    payload = prefix + payload
-    assert check_armored_payload(payload, outgoing=False) == True
-    assert check_armored_payload(payload, outgoing=True) == True
-
-    payload = payload.removesuffix("\r\n")
-    assert check_armored_payload(payload, outgoing=False) == True
-    assert check_armored_payload(payload, outgoing=True) == True
-
-    payload = payload.removesuffix("\r\n")
-    assert check_armored_payload(payload, outgoing=False) == True
-    assert check_armored_payload(payload, outgoing=True) == True
-
-    payload = payload.removesuffix("\r\n")
-    assert check_armored_payload(payload, outgoing=False) == True
-    assert check_armored_payload(payload, outgoing=True) == True
-
-    payload = """-----BEGIN PGP MESSAGE-----\r
-\r
-HELLOWORLD
------END PGP MESSAGE-----\r
-\r
-"""
-    assert check_armored_payload(payload, outgoing=False) == False
-    assert check_armored_payload(payload, outgoing=True) == False
-
-    payload = """-----BEGIN PGP MESSAGE-----\r
-\r
-=njUN
------END PGP MESSAGE-----\r
-\r
-"""
-    assert check_armored_payload(payload, outgoing=False) == False
-    assert check_armored_payload(payload, outgoing=True) == False
-
-    # Test payload using partial body length
-    # as generated by GopenPGP.
-    payload = """-----BEGIN PGP MESSAGE-----\r
-\r
-wV4DdCVjRfOT3TQSAQdAY5+pjT6mlCxPGdR3be4w7oJJRUGIPI/Vnh+mJxGSm34w\r
-LNlVc89S1g22uQYFif2sUJsQWbpoHpNkuWpkSgOaHmNvrZiY/YU5iv+cZ3LbmtUG\r
-0uoBisSHh9O1c+5sYZSbrvYZ1NOwlD7Fv/U5/Mw4E5+CjxfdgNGp5o3DDddzPK78\r
-jseDhdSXxnaiIJC93hxNX6R1RPt3G2gukyzx69wciPQShcF8zf3W3o75Ed7B8etV\r
-QEeB16xzdFhKa9JxdjTu3osgCs21IO7wpcFkjc7nZzlW6jPnELJJaNmv4yOOCjMp\r
-6YAkaN/BkL+jHTznHDuDsT5ilnTXpwHDU1Cm9PIx/KFcNCQnIB+2DcdIHPHUH1ci\r
-jvqoeXAVWjKXEjS7PqPFuP/xGbrWG2ugs+toXJOKbgRkExvKs1dwPFKrgghvCVbW\r
-AcKejQKAPArLwpkA7aD875TZQShvGt74fNs45XBlGOYOnNOAJ1KAmzrXLIDViyyB\r
-kDsmTBk785xofuCkjBpXSe6vsMprPzCteDfaUibh8FHeJjucxPerwuOPEmnogNaf\r
-YyL4+iy8H8I9/p7pmUqILprxTG0jTOtlk0bTVzeiF56W1xbtSEMuOo4oFbQTyOM2\r
-bKXaYo774Jm+rRtKAnnI2dtf9RpK19cog6YNzfYjesLKbXDsPZbN5rmwyFiCvvxC\r
-kQ6JLob+B2fPdY2gzy7LypxktS8Zi1HJcWDHJGVmQodaDLqKUObb4M26bXDe6oxI\r
-NS8PJz5exVbM3KhZnUOEn6PJRBBf5a/ZqxlhZPcQo/oBuhKpBRpO5kSDwPIUByu3\r
-UlXLSkpMqe9pUarAOEuQjfl2RVY7U+RrQYp4YP5keMO+i8NCefAFbowTTufO1JIq\r
-2nVgCi/QVnxZyEc9OYt/8AE3g4cdojE+vsSDifZLSWYIetpfrohHv3dT3StD1QRG\r
-0QE6qq6oKpg/IL0cjvuX4c7a7bslv2fXp8t75y37RU6253qdIebhxc/cRhPbc/yu\r
-p0YLyD4SrvKTLP2ZV95jT4IPEpqm4AN3QmiOzdtqR2gLyb62L8QfqI/FdwsIiRiM\r
-hqydwoqt/lfSqG1WKPh+6EkMkH+TDiCC1BQdbN1MNcyUtcjb35PR2c8Ld2TF3guA\r
-jLIqMt/Vb7hBoMb2FcsOYY25ka9oV62OwgKWLXnFzk+modMR5fzb4kxVVAYEqP+D\r
-T5KO1Vs76v1fyPGOq6BbBCvLwTqe/e6IZInJles4v5jrhnLcGKmNGivCUDe6X6NY\r
-UKNt5RsZllwDQpaAb5dMNhyrk8SgIE7TBI7rvqIdUCE52Vy+0JDxFg5olRpFUfO6\r
-/MyTW3Yo/ekk/npHr7iYYqJTCc21bDGLWQcIo/XO7WPxrKNWGBNPFnkRdw0MaKr4\r
-+cEM3V8NFnSEpC12xA+RX/CezuJtwXZK5MpG76eYqMO6qyC+c25YcFecEufDZDxx\r
-ZLqRszVRyxyWPtk/oIeQK2v9wOqY6N9/ff01gHz69vqYqN5bUw/QKZsmx1zW+gPw\r
-6x2tDK2BHeYl182gCbhlKISRFwCtbjqZSkiKWao/VtygHkw0fK34avJuyQ/X9YaN\r
-BRy+7Lf3VA53pnB5WJ1xwRXN8VDvmZeXzv2krHveCMemj0OjnRoCLu117xN0A5m9\r
-Fm/RoDix5PolDHtWTtr2m1n2hp2LHnj8at9lFEd0SKhAYHVL9KjzycwWODZRXt+x\r
-zGDDuooEeTvdY5NLyKcl4gETz1ZP4Ez5jGGjhPSwSpq1mU7UaJ9ZXXdr4KHyifW6\r
-ggNzNsGhXTap7IWZpTtqXABydfiBshmH2NjqtNDwBweJVSgP10+r0WhMWlaZs6xl\r
-V3o5yskJt6GlkwpJxZrTvN6Tiww/eW7HFV6NGf7IRSWY5tJc/iA7/92tOmkdvJ1q\r
-myLbG7cJB787QjplEyVe2P/JBO6xYvbkJLf9Q+HaviTO25rugRSrYsoKMDfO8VlQ\r
-1CcnTPVtApPZJEQzAWJEgVAM8uIlkqWJJMgyWT34sTkdBeCUFGloXQFs9Yxd0AGf\r
-/zHEkYZSTKpVSvAIGu4=\r
-=6iHb\r
------END PGP MESSAGE-----\r
-"""
-    assert check_armored_payload(payload, outgoing=False) == True
-    assert check_armored_payload(payload, outgoing=True) == True

chatmaild/src/chatmaild/tests/test_filtermail_blackbox.py

@@ -1,9 +1,15 @@
+import shutil
 import smtplib
 import subprocess
 import sys
 
 import pytest
 
+pytestmark = pytest.mark.skipif(
+    shutil.which("filtermail") is None,
+    reason="filtermail binary not found",
+)
+
 
 @pytest.fixture
 def smtpserver():
@@ -41,6 +47,8 @@ def test_one_mail(
     make_config, make_popen, smtpserver, maildata, filtermail_mode, monkeypatch
 ):
     monkeypatch.setenv("PYTHONUNBUFFERED", "1")
+    # DKIM is tested by cmdeploy tests.
+    monkeypatch.setenv("FILTERMAIL_SKIP_DKIM", "1")
     smtp_inject_port = 20025
     if filtermail_mode == "outgoing":
         settings = dict(
@@ -58,6 +66,10 @@ def test_one_mail(
 
     popen = make_popen(["filtermail", path, filtermail_mode])
     line = popen.stderr.readline().strip()
+
+    # skip a warning that FILTERMAIL_SKIP_DKIM shouldn't be used in prod
+    if b"DKIM verification DISABLED!" in line:
+        line = popen.stderr.readline().strip()
     if b"loop" not in line:
         print(line.decode("ascii"), file=sys.stderr)
         pytest.fail("starting filtermail failed")

chatmaild/src/chatmaild/tests/test_metadata.py

@@ -314,6 +314,51 @@ def test_persistent_queue_items(tmp_path, testaddr, token):
     assert not queue_item < item2 and not item2 < queue_item
 
 
+def test_turn_credentials_exception_returns_N(notifier, metadata, monkeypatch):
+    """Test that turn_credentials() failure returns N\\n instead of crashing."""
+    import chatmaild.metadata
+
+    dictproxy = MetadataDictProxy(
+        notifier=notifier,
+        metadata=metadata,
+        turn_hostname="turn.example.org",
+    )
+
+    def mock_turn_credentials():
+        raise ConnectionRefusedError("socket not available")
+
+    monkeypatch.setattr(chatmaild.metadata, "turn_credentials", mock_turn_credentials)
+
+    transactions = {}
+    res = dictproxy.handle_dovecot_request(
+        "Lshared/0123/vendor/vendor.dovecot/pvt/server/vendor/deltachat/turn"
+        "\tuser@example.org",
+        transactions,
+    )
+    assert res == "N\n"
+
+
+def test_turn_credentials_success(notifier, metadata, monkeypatch):
+    """Test that valid turn_credentials() returns TURN URI."""
+    import chatmaild.metadata
+
+    dictproxy = MetadataDictProxy(
+        notifier=notifier,
+        metadata=metadata,
+        turn_hostname="turn.example.org",
+    )
+
+    monkeypatch.setattr(chatmaild.metadata, "turn_credentials", lambda: "user:pass")
+
+    transactions = {}
+    res = dictproxy.handle_dovecot_request(
+        "Lshared/0123/vendor/vendor.dovecot/pvt/server/vendor/deltachat/turn"
+        "\tuser@example.org",
+        transactions,
+    )
+    assert res == "Oturn.example.org:3478:user:pass\n"
+
+
 def test_iroh_relay(dictproxy):
     rfile = io.BytesIO(
         b"\n".join(

chatmaild/src/chatmaild/tests/test_metrics.py

@@ -1,24 +0,0 @@
-from chatmaild.metrics import main
-
-
-def test_main(tmp_path, capsys):
-    paths = []
-    for x in ("ci-asllkj", "ac_12l3kj", "qweqwe", "ci-l1k2j31l2k3"):
-        p = tmp_path.joinpath(x)
-        p.mkdir()
-        p.joinpath("cur").mkdir()
-        paths.append(p)
-
-    tmp_path.joinpath("nomailbox").mkdir()
-
-    main(tmp_path)
-    out, _ = capsys.readouterr()
-    d = {}
-    for line in out.split("\n"):
-        if line.strip() and not line.startswith("#"):
-            name, num = line.split()
-            d[name] = int(num)
-
-    assert d["accounts"] == 4
-    assert d["ci_accounts"] == 3
-    assert d["nonci_accounts"] == 1

chatmaild/src/chatmaild/tests/test_newmail.py

@@ -1,7 +1,11 @@
 import json
 
 import chatmaild
-from chatmaild.newemail import create_newemail_dict, print_new_account
+from chatmaild.newemail import (
+    create_dclogin_url,
+    create_newemail_dict,
+    print_new_account,
+)
 
 
 def test_create_newemail_dict(example_config):
@@ -15,6 +19,18 @@ def test_create_newemail_dict(example_config):
     assert ac1["password"] != ac2["password"]
 
 
+def test_create_dclogin_url():
+    url = create_dclogin_url("user@example.org", "p@ss w+rd")
+    assert url.startswith("dclogin:")
+    assert "v=1" in url
+    assert "ic=3" in url
+
+    assert "user@example.org" in url
+    # password special chars must be encoded
+    assert "p%40ss" in url
+    assert "w%2Brd" in url
+
+
 def test_print_new_account(capsys, monkeypatch, maildomain, tmpdir, example_config):
     monkeypatch.setattr(chatmaild.newemail, "CONFIG_PATH", str(example_config._inipath))
     print_new_account()
@@ -25,3 +41,20 @@ def test_print_new_account(capsys, monkeypatch, maildomain, tmpdir, example_conf
     dic = json.loads(lines[2])
     assert dic["email"].endswith(f"@{example_config.mail_domain}")
     assert len(dic["password"]) >= 10
+    # default tls_cert=acme should not include dclogin_url
+    assert "dclogin_url" not in dic
+
+
+def test_print_new_account_self_signed(capsys, monkeypatch, make_config):
+    config = make_config("_test.example.org")
+    monkeypatch.setattr(chatmaild.newemail, "CONFIG_PATH", str(config._inipath))
+    print_new_account()
+    out, err = capsys.readouterr()
+    lines = out.split("\n")
+    dic = json.loads(lines[2])
+    assert "dclogin_url" in dic
+    url = dic["dclogin_url"]
+    assert url.startswith("dclogin:")
+    assert "ic=3" in url
+
+    assert dic["email"].split("@")[0] in url

chatmaild/src/chatmaild/tests/test_turnserver.py

@@ -0,0 +1,73 @@
+import socket
+import threading
+import time
+from unittest.mock import patch
+
+import pytest
+
+from chatmaild.turnserver import turn_credentials
+
+SOCKET_PATH = "/run/chatmail-turn/turn.socket"
+
+
+@pytest.fixture
+def turn_socket(tmp_path):
+    """Create a real Unix socket server at a temp path."""
+    sock_path = str(tmp_path / "turn.socket")
+    server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    server.bind(sock_path)
+    server.listen(1)
+    yield sock_path, server
+    server.close()
+
+
+def _call_turn_credentials(sock_path):
+    """Call turn_credentials but connect to sock_path instead of hardcoded path."""
+    original_connect = socket.socket.connect
+
+    def patched_connect(self, address):
+        if address == SOCKET_PATH:
+            address = sock_path
+        return original_connect(self, address)
+
+    with patch.object(socket.socket, "connect", patched_connect):
+        return turn_credentials()
+
+
+def test_turn_credentials_timeout(turn_socket):
+    """Server accepts but never responds — must raise socket.timeout."""
+    sock_path, server = turn_socket
+
+    def accept_and_hang():
+        conn, _ = server.accept()
+        time.sleep(30)
+        conn.close()
+
+    t = threading.Thread(target=accept_and_hang, daemon=True)
+    t.start()
+
+    with pytest.raises(socket.timeout):
+        _call_turn_credentials(sock_path)
+
+
+def test_turn_credentials_connection_refused(tmp_path):
+    """Socket file doesn't exist — must raise ConnectionRefusedError or FileNotFoundError."""
+    missing = str(tmp_path / "nonexistent.socket")
+    with pytest.raises((ConnectionRefusedError, FileNotFoundError)):
+        _call_turn_credentials(missing)
+
+
+def test_turn_credentials_success(turn_socket):
+    """Server responds with credentials — must return stripped string."""
+    sock_path, server = turn_socket
+
+    def respond():
+        conn, _ = server.accept()
+        conn.sendall(b"testuser:testpass\n")
+        conn.close()
+
+    t = threading.Thread(target=respond, daemon=True)
+    t.start()
+
+    result = _call_turn_credentials(sock_path)
+    assert result == "testuser:testpass"

chatmaild/src/chatmaild/turnserver.py

@@ -4,6 +4,7 @@ import socket
 
 def turn_credentials() -> str:
     with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as client_socket:
+        client_socket.settimeout(5)
         client_socket.connect("/run/chatmail-turn/turn.socket")
         with client_socket.makefile("rb") as file:
             return file.readline().decode("utf-8").strip()

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@@ -1,209 +0,0 @@
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cmdeploy/pyproject.toml

@@ -10,7 +10,6 @@ dependencies = [
   "pillow",
   "qrcode",
   "markdown",
-  "pytest",
   "setuptools>=68",
   "termcolor",
   "build",
@@ -20,6 +19,8 @@ dependencies = [
   "pytest-xdist", 
   "execnet",
   "imap_tools",
+  "deltachat-rpc-client",
+  "deltachat-rpc-server",
 ]
 
 [project.scripts]

cmdeploy/src/cmdeploy/acmetool/__init__.py

@@ -63,11 +63,11 @@ class AcmetoolDeployer(Deployer):
 
         server.shell(
             name=f"Remove old acmetool desired files for {self.domains[0]}",
-            commands=[f'rm -f /var/lib/acme/desired/"{self.domains[0]}"-*'],
+            commands=[f"rm -f /var/lib/acme/desired/{self.domains[0]}-*"],
         )
         files.template(
             src=importlib.resources.files(__package__).joinpath("desired.yaml.j2"),
-            dest=f"/var/lib/acme/desired/{self.domains[0]}", # 0 is mailhost TLD
+            dest=f"/var/lib/acme/desired/{self.domains[0]}",  # 0 is mailhost TLD
             user="root",
             group="root",
             mode="644",
@@ -108,13 +108,6 @@ class AcmetoolDeployer(Deployer):
         self.need_restart_reconcile_timer = reconcile_timer_file.changed
 
     def activate(self):
-        systemd.service(
-            name="Stop nginx to free port 80 for acmetool",
-            service="nginx.service",
-            running=False,
-            enabled=True,
-        )
-
         systemd.service(
             name="Setup acmetool-redirector service",
             service="acmetool-redirector.service",
@@ -142,15 +135,6 @@ class AcmetoolDeployer(Deployer):
         )
         self.need_restart_reconcile_timer = False
 
-        # Add the first domain to /etc/hosts to help acmetool's self-test
-        # bypass external firewalls or split-brain DNS issues.
-        server.shell(
-            name=f"Add {self.domains[0]} to /etc/hosts for self-test",
-            commands=[
-                f"grep -q ' {self.domains[0]}$' /etc/hosts || echo '127.0.0.1 {self.domains[0]}' >> /etc/hosts"
-            ],
-        )
-
         server.shell(
             name=f"Reconcile certificates for: {', '.join(self.domains)}",
             commands=["acmetool --batch --xlog.severity=debug reconcile"],

cmdeploy/src/cmdeploy/acmetool/acmetool-redirector.service

@@ -3,7 +3,7 @@ Description=acmetool HTTP redirector
 
 [Service]
 Type=notify
-ExecStart=/usr/bin/acmetool redirector --service.uid=daemon
+ExecStart=/usr/bin/acmetool redirector --service.uid=daemon --bind=127.0.0.1:402
 Restart=always
 RestartSec=30
 

cmdeploy/src/cmdeploy/basedeploy.py

@@ -1,10 +1,38 @@
 import importlib.resources
 import io
 import os
+from contextlib import contextmanager
 
 from pyinfra.operations import files, server, systemd
 
 
+def has_systemd():
+    """Returns False during Docker image builds or any other non-systemd environment."""
+    return os.path.isdir("/run/systemd/system")
+
+
+@contextmanager
+def blocked_service_startup():
+    """Prevent services from auto-starting during package installation.
+
+    Installs a ``/usr/sbin/policy-rc.d`` that exits 101, blocking any
+    service from being started by the package manager.  This avoids bind
+    conflicts and CPU/RAM spikes during initial setup.  The file is removed
+    when the context exits.
+    """
+    # For documentation about policy-rc.d, see:
+    # https://people.debian.org/~hmh/invokerc.d-policyrc.d-specification.txt
+    files.put(
+        src=get_resource("policy-rc.d"),
+        dest="/usr/sbin/policy-rc.d",
+        user="root",
+        group="root",
+        mode="755",
+    )
+    yield
+    files.file("/usr/sbin/policy-rc.d", present=False)
+
+
 def get_resource(arg, pkg=__package__):
     return importlib.resources.files(pkg).joinpath(arg)
 
@@ -17,9 +45,8 @@ def configure_remote_units(mail_domain, units) -> None:
 
     # install systemd units
     for fn in units:
-        execpath = fn if fn != "filtermail-incoming" else "filtermail"
         params = dict(
-            execpath=f"{remote_venv_dir}/bin/{execpath}",
+            execpath=f"{remote_venv_dir}/bin/{fn}",
             config_path=remote_chatmail_inipath,
             remote_venv_dir=remote_venv_dir,
             mail_domain=mail_domain,

cmdeploy/src/cmdeploy/chatmail.zone.j2

@@ -1,30 +0,0 @@
-;
-; Required DNS entries for chatmail servers 
-;
-{% if A %}
-{{ mail_domain }}.                   A     {{ A }}
-{% endif %}
-{% if AAAA %}
-{{ mail_domain }}.                   AAAA  {{ AAAA }}
-{% endif %}
-{{ mail_domain }}.                   MX 10 {{ mail_domain }}.
-_mta-sts.{{ mail_domain }}.          TXT "v=STSv1; id={{ sts_id }}"
-mta-sts.{{ mail_domain }}.           CNAME {{ mail_domain }}.
-www.{{ mail_domain }}.               CNAME {{ mail_domain }}.
-{{ dkim_entry }}
-
-;
-; Recommended DNS entries for interoperability and security-hardening
-;
-{{ mail_domain }}.                   TXT "v=spf1 a ~all"
-_dmarc.{{ mail_domain }}.            TXT "v=DMARC1;p=reject;adkim=s;aspf=s"
-
-{% if acme_account_url %}
-{{ mail_domain }}.                   CAA 0 issue "letsencrypt.org;accounturi={{ acme_account_url }}"
-{% endif %}
-_adsp._domainkey.{{ mail_domain }}.  TXT "dkim=discardable"
-
-_submission._tcp.{{ mail_domain }}.  SRV 0 1 587 {{ mail_domain }}.
-_submissions._tcp.{{ mail_domain }}. SRV 0 1 465 {{ mail_domain }}.
-_imap._tcp.{{ mail_domain }}.        SRV 0 1 143 {{ mail_domain }}.
-_imaps._tcp.{{ mail_domain }}.       SRV 0 1 993 {{ mail_domain }}.

cmdeploy/src/cmdeploy/cmdeploy.py

@@ -5,7 +5,6 @@ along with command line option and subcommand parsing.
 
 import argparse
 import importlib.resources
-import importlib.util
 import os
 import pathlib
 import shutil
@@ -71,6 +70,11 @@ def run_cmd_options(parser):
         action="store_true",
         help="install/upgrade the server, but disable postfix & dovecot for now",
     )
+    parser.add_argument(
+        "--website-only",
+        action="store_true",
+        help="only update/deploy the website, skipping full server upgrade/deployment, useful when you only changed/updated the web pages and don't need to re-run a full server upgrade",
+    )
     parser.add_argument(
         "--skip-dns-check",
         dest="dns_check_disabled",
@@ -86,20 +90,27 @@ def run_cmd(args, out):
     ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain
     sshexec = get_sshexec(ssh_host)
     require_iroh = args.config.enable_iroh_relay
+    strict_tls = args.config.tls_cert_mode == "acme"
     if not args.dns_check_disabled:
         remote_data = dns.get_initial_remote_data(sshexec, args.config.mail_domain)
-        if not dns.check_initial_remote_data(remote_data, print=out.red):
+        if not dns.check_initial_remote_data(remote_data, strict_tls=strict_tls, print=out.red):
             return 1
 
     env = os.environ.copy()
     env["CHATMAIL_INI"] = args.inipath
+    env["CHATMAIL_WEBSITE_ONLY"] = "True" if args.website_only else ""
     env["CHATMAIL_DISABLE_MAIL"] = "True" if args.disable_mail else ""
     env["CHATMAIL_REQUIRE_IROH"] = "True" if require_iroh else ""
+    if not args.dns_check_disabled:
+        env["CHATMAIL_ADDR_V4"] = remote_data.get("A") or ""
+        env["CHATMAIL_ADDR_V6"] = remote_data.get("AAAA") or ""
     deploy_path = importlib.resources.files(__package__).joinpath("run.py").resolve()
     pyinf = "pyinfra --dry" if args.dry_run else "pyinfra"
 
     cmd = f"{pyinf} --ssh-user root {ssh_host} {deploy_path} -y"
     if ssh_host in ["localhost", "@docker"]:
+        if ssh_host == "@docker":
+            env["CHATMAIL_NOPORTCHECK"] = "True"
         cmd = f"{pyinf} @local {deploy_path} -y"
 
     if version.parse(pyinfra.__version__) < version.parse("3"):
@@ -107,19 +118,18 @@ def run_cmd(args, out):
         return 1
 
     try:
-        retcode = out.check_call(cmd, env=env)
-        if retcode == 0:
-            out.green("Deploy completed, call `cmdeploy dns` next.")
-        elif not remote_data["acme_account_url"]:
+        out.check_call(cmd, env=env)
+        if args.website_only:
+            out.green("Website deployment completed.")
+        elif not args.dns_check_disabled and strict_tls and not remote_data["acme_account_url"]:
             out.red("Deploy completed but letsencrypt not configured")
             out.red("Run 'cmdeploy run' again")
-            retcode = 0
         else:
-            out.red("Deploy failed")
+            out.green("Deploy completed, call `cmdeploy dns` next.")
+        return 0
     except subprocess.CalledProcessError:
         out.red("Deploy failed")
-        retcode = 1
-    return retcode
+        return 1
 
 
 def dns_cmd_options(parser):
@@ -137,11 +147,13 @@ def dns_cmd(args, out):
     """Check DNS entries and optionally generate dns zone file."""
     ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain
     sshexec = get_sshexec(ssh_host, verbose=args.verbose)
+    tls_cert_mode = args.config.tls_cert_mode
+    strict_tls = tls_cert_mode == "acme"
     remote_data = dns.get_initial_remote_data(sshexec, args.config.mail_domain)
-    if not remote_data:
+    if not dns.check_initial_remote_data(remote_data, strict_tls=strict_tls):
         return 1
 
-    if not remote_data["acme_account_url"]:
+    if strict_tls and not remote_data["acme_account_url"]:
         out.red("could not get letsencrypt account url, please run 'cmdeploy run'")
         return 1
 
@@ -149,6 +161,7 @@ def dns_cmd(args, out):
         out.red("could not determine dkim_entry, please run 'cmdeploy run'")
         return 1
 
+    remote_data["strict_tls"] = strict_tls
     zonefile = dns.get_filled_zone_file(remote_data)
 
     if args.zonefile:
@@ -189,17 +202,16 @@ def test_cmd_options(parser):
         action="store_true",
         help="also run slow tests",
     )
+    add_ssh_host_option(parser)
 
 
 def test_cmd(args, out):
-    """Run local and online tests for chatmail deployment.
+    """Run local and online tests for chatmail deployment."""
 
-    This will automatically uv-pip-install 'deltachat' if it's not available.
-    """
-
-    x = importlib.util.find_spec("deltachat")
-    if x is None:
-        out.check_call("uv pip install deltachat")
+    env = os.environ.copy()
+    env["CHATMAIL_INI"] = str(args.inipath.absolute())
+    if args.ssh_host:
+        env["CHATMAIL_SSH"] = args.ssh_host
 
     pytest_path = shutil.which("pytest")
     pytest_args = [
@@ -213,7 +225,7 @@ def test_cmd(args, out):
     ]
     if args.slow:
         pytest_args.append("--slow")
-    ret = out.run_ret(pytest_args)
+    ret = out.run_ret(pytest_args, env=env)
     return ret
 
 
@@ -314,7 +326,7 @@ def add_config_option(parser):
         "--config",
         dest="inipath",
         action="store",
-        default=Path("chatmail.ini"),
+        default=Path(os.environ.get("CHATMAIL_INI", "chatmail.ini")),
         type=Path,
         help="path to the chatmail.ini file",
     )
@@ -364,14 +376,14 @@ def get_parser():
     return parser
 
 
-def get_sshexec(ssh_host: str, verbose=True):
+def get_sshexec(ssh_host: str, verbose=True, **kwargs):
     if ssh_host in ["localhost", "@local"]:
         return LocalExec(verbose, docker=False)
     elif ssh_host == "@docker":
         return LocalExec(verbose, docker=True)
     if verbose:
         print(f"[ssh] login to {ssh_host}")
-    return SSHExec(ssh_host, verbose=verbose)
+    return SSHExec(ssh_host, verbose=verbose, **kwargs)
 
 
 def main(args=None):

cmdeploy/src/cmdeploy/deployers.py

@@ -2,18 +2,20 @@
 Chat Mail pyinfra deploy.
 """
 
+import os
 import shutil
 import subprocess
 import sys
-from io import StringIO
+from io import BytesIO, StringIO
 from pathlib import Path
 
 from chatmaild.config import read_config
 from pyinfra import facts, host, logger
 from pyinfra.api import FactBase
+from pyinfra.facts import hardware
 from pyinfra.facts.files import Sha256File
 from pyinfra.facts.systemd import SystemdEnabled
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.operations import apt, files, pip, server, systemd
 
 from cmdeploy.cmdeploy import Out
 
@@ -22,20 +24,25 @@ from .basedeploy import (
     Deployer,
     Deployment,
     activate_remote_units,
+    blocked_service_startup,
     configure_remote_units,
     get_resource,
+    has_systemd,
 )
 from .dovecot.deployer import DovecotDeployer
+from .external.deployer import ExternalTlsDeployer
+from .filtermail.deployer import FiltermailDeployer
 from .mtail.deployer import MtailDeployer
 from .nginx.deployer import NginxDeployer
 from .opendkim.deployer import OpendkimDeployer
 from .postfix.deployer import PostfixDeployer
+from .selfsigned.deployer import SelfSignedTlsDeployer
 from .www import build_webpages, find_merge_conflict, get_paths
 
 
 class Port(FactBase):
     """
-    Returns the process occuping a port.
+    Returns the process occupying a port.
     """
 
     def command(self, port: int) -> str:
@@ -54,7 +61,7 @@ def _build_chatmaild(dist_dir) -> None:
         shutil.rmtree(dist_dir)
     dist_dir.mkdir()
     subprocess.check_output(
-        ["uv", "run", "python", "-m", "build", "-n"]
+        [sys.executable, "-m", "build", "-n"]
         + ["--sdist", "chatmaild", "--outdir", str(dist_dir)]
     )
     entries = list(dist_dir.iterdir())
@@ -63,6 +70,8 @@ def _build_chatmaild(dist_dir) -> None:
 
 
 def remove_legacy_artifacts():
+    if not has_systemd():
+        return
     # disable legacy doveauth-dictproxy.service
     if host.get_fact(SystemdEnabled).get("doveauth-dictproxy.service"):
         systemd.service(
@@ -80,20 +89,10 @@ def _install_remote_venv_with_chatmaild() -> None:
     remote_dist_file = f"{remote_base_dir}/dist/{dist_file.name}"
     remote_venv_dir = f"{remote_base_dir}/venv"
     root_owned = dict(user="root", group="root", mode="644")
-    root_owned_dir = dict(user="root", group="root", mode="755")
-    uv_prefix = "UV_PYTHON_INSTALL_DIR=/usr/local/share/uv/python"
 
-    server.shell(
-        name="Install uv globally if not present",
-        commands=[
-            "command -v uv >/dev/null 2>&1 || (curl -LsSf https://astral.sh/uv/install.sh | INSTALLER_NO_MODIFY_PATH=1 sudo sh -s -- --install-dir /usr/local/bin)",
-        ],
-    )
-
-    files.directory(
-        name="Ensure shared uv python directory exists",
-        path="/usr/local/share/uv/python",
-        **root_owned_dir,
+    apt.packages(
+        name="apt install python3-virtualenv",
+        packages=["python3-virtualenv"],
     )
 
     files.put(
@@ -103,48 +102,28 @@ def _install_remote_venv_with_chatmaild() -> None:
         create_remote_dir=True,
         **root_owned,
     )
-    # Ensure parent directory is accessible
-    files.directory(
-        name=f"Ensure {remote_base_dir} is accessible",
-        path=remote_base_dir,
-        **root_owned_dir,
-    )
-    files.directory(
-        name=f"Ensure {remote_base_dir}/dist is accessible",
-        path=f"{remote_base_dir}/dist",
-        **root_owned_dir,
-    )
 
-    server.shell(
+    pip.virtualenv(
         name=f"chatmaild virtualenv {remote_venv_dir}",
-        commands=[f"{uv_prefix} uv venv {remote_venv_dir} --python 3.11 --allow-existing"],
-    )
-
-    # Ensure venv and managed pythons are accessible by other users (like www-data)
-    server.shell(
-        name="Make venv and managed pythons accessible",
-        commands=[
-            f"chmod -R a+rX {remote_venv_dir}",
-            "chmod -R a+rX /usr/local/share/uv/python || true",
-        ],
+        path=remote_venv_dir,
+        always_copy=True,
     )
 
     apt.packages(
-        name="install build-essential and headers to build crypt_r source package",
-        packages=["build-essential", "python3-dev"],
+        name="install gcc and headers to build crypt_r source package",
+        packages=["gcc", "python3-dev"],
     )
 
     server.shell(
-        name=f"forced uv-pip-install {dist_file.name}",
+        name=f"forced pip-install {dist_file.name}",
         commands=[
-            f"{uv_prefix} uv pip install --python {remote_venv_dir}/bin/python --force-reinstall {remote_dist_file}"
+            f"{remote_venv_dir}/bin/pip install --force-reinstall {remote_dist_file}"
         ],
     )
 
 
 def _configure_remote_venv_with_chatmaild(config) -> None:
     remote_base_dir = "/usr/local/lib/chatmaild"
-    remote_venv_dir = f"{remote_base_dir}/venv"
     remote_chatmail_inipath = f"{remote_base_dir}/chatmail.ini"
     root_owned = dict(user="root", group="root", mode="644")
 
@@ -155,48 +134,32 @@ def _configure_remote_venv_with_chatmaild(config) -> None:
         **root_owned,
     )
 
-    files.template(
-        src=get_resource("metrics.cron.j2"),
-        dest="/etc/cron.d/chatmail-metrics",
-        user="root",
-        group="root",
-        mode="644",
-        config={
-            "mailboxes_dir": config.mailboxes_dir,
-            "execpath": f"{remote_venv_dir}/bin/chatmail-metrics",
-        },
+    files.file(
+        path="/etc/cron.d/chatmail-metrics",
+        present=False,
+    )
+    files.file(
+        path="/var/www/html/metrics",
+        present=False,
     )
 
 
 class UnboundDeployer(Deployer):
+    def __init__(self, config):
+        self.config = config
+        self.need_restart = False
+
     def install(self):
-        # Run local DNS resolver `unbound`.
-        # `resolvconf` takes care of setting up /etc/resolv.conf
-        # to use 127.0.0.1 as the resolver.
+        # Run local DNS resolver `unbound`. `resolvconf` takes care of
+        # setting up /etc/resolv.conf to use 127.0.0.1 as the resolver.
 
-        #
-        # On an IPv4-only system, if unbound is started but not
-        # configured, it causes subsequent steps to fail to resolve hosts.
-        # Here, we use policy-rc.d to prevent unbound from starting up
-        # on initial install.  Later, we will configure it and start it.
-        #
-        # For documentation about policy-rc.d, see:
-        # https://people.debian.org/~hmh/invokerc.d-policyrc.d-specification.txt
-        #
-        files.put(
-            src=get_resource("policy-rc.d"),
-            dest="/usr/sbin/policy-rc.d",
-            user="root",
-            group="root",
-            mode="755",
-        )
-
-        apt.packages(
-            name="Install unbound",
-            packages=["unbound", "unbound-anchor", "dnsutils"],
-        )
-
-        files.file("/usr/sbin/policy-rc.d", present=False)
+        # On an IPv4-only system, if unbound is started but not configured,
+        # it causes subsequent steps to fail to resolve hosts.
+        with blocked_service_startup():
+            apt.packages(
+                name="Install unbound",
+                packages=["unbound", "unbound-anchor", "dnsutils"],
+            )
 
     def configure(self):
         server.shell(
@@ -205,17 +168,29 @@ class UnboundDeployer(Deployer):
                 "unbound-anchor -a /var/lib/unbound/root.key || true",
             ],
         )
+        if self.config.disable_ipv6:
+            files.directory(
+                path="/etc/unbound/unbound.conf.d",
+                present=True,
+                user="root",
+                group="root",
+                mode="755",
+            )
+            conf = files.put(
+                src=get_resource("unbound/unbound.conf.j2"),
+                dest="/etc/unbound/unbound.conf.d/chatmail.conf",
+                user="root",
+                group="root",
+                mode="644",
+            )
+        else:
+            conf = files.file(
+                path="/etc/unbound/unbound.conf.d/chatmail.conf",
+                present=False,
+            )
+        self.need_restart |= conf.changed
 
     def activate(self):
-        # Stop and disable systemd-resolved if it's running.
-        systemd.service(
-            name="Stop and disable systemd-resolved",
-            service="systemd-resolved.service",
-            running=False,
-            enabled=False,
-            _ignore_errors=True,
-        )
-
         server.shell(
             name="Generate root keys for validating DNSSEC",
             commands=[
@@ -228,6 +203,7 @@ class UnboundDeployer(Deployer):
             service="unbound.service",
             running=True,
             enabled=True,
+            restarted=self.need_restart,
         )
 
 
@@ -275,6 +251,9 @@ class WebsiteDeployer(Deployer):
             # if www_folder is a hugo page, build it
             if build_dir:
                 www_path = build_webpages(src_dir, build_dir, self.config)
+                if www_path is None:
+                    logger.warning("Web page build failed, skipping website deployment")
+                    return
             # if it is not a hugo page, upload it as is
             files.rsync(
                 f"{www_path}/", "/var/www/html", flags=["-avz", "--chown=www-data"]
@@ -309,7 +288,7 @@ class LegacyRemoveDeployer(Deployer):
             present=False,
         )
         # remove echobot if it is still running
-        if host.get_fact(SystemdEnabled).get("echobot.service"):
+        if has_systemd() and host.get_fact(SystemdEnabled).get("echobot.service"):
             systemd.service(
                 name="Disable echobot.service",
                 service="echobot.service",
@@ -341,12 +320,12 @@ class TurnDeployer(Deployer):
     def install(self):
         (url, sha256sum) = {
             "x86_64": (
-                "https://github.com/chatmail/chatmail-turn/releases/download/v0.3/chatmail-turn-x86_64-linux",
-                "841e527c15fdc2940b0469e206188ea8f0af48533be12ecb8098520f813d41e4",
+                "https://github.com/chatmail/chatmail-turn/releases/download/v0.4/chatmail-turn-x86_64-linux",
+                "1ec1f5c50122165e858a5a91bcba9037a28aa8cb8b64b8db570aa457c6141a8a",
             ),
             "aarch64": (
-                "https://github.com/chatmail/chatmail-turn/releases/download/v0.3/chatmail-turn-aarch64-linux",
-                "a5fc2d06d937b56a34e098d2cd72a82d3e89967518d159bf246dc69b65e81b42",
+                "https://github.com/chatmail/chatmail-turn/releases/download/v0.4/chatmail-turn-aarch64-linux",
+                "0fb3e792419494e21ecad536464929dba706bb2c88884ed8f1788141d26fc756",
             ),
         }[host.get_fact(facts.server.Arch)]
 
@@ -454,8 +433,6 @@ class ChatmailVenvDeployer(Deployer):
     def __init__(self, config):
         self.config = config
         self.units = (
-            "filtermail",
-            "filtermail-incoming",
             "chatmail-metadata",
             "lastlogin",
             "chatmail-expire",
@@ -468,21 +445,6 @@ class ChatmailVenvDeployer(Deployer):
         _install_remote_venv_with_chatmaild()
 
     def configure(self):
-        # Ensure postfix can read certificates
-        server.shell(
-            name="Add postfix to ssl-cert group and fix acme permissions",
-            commands=[
-                "groupadd -f ssl-cert",
-                "usermod -a -G ssl-cert postfix",
-                "usermod -a -G ssl-cert dovecot",
-                "if [ -d /var/lib/acme/live ]; then "
-                "chown -R root:ssl-cert /var/lib/acme/live && "
-                "chmod 750 /var/lib/acme/live && "
-                "chmod 640 /var/lib/acme/live/*/privkey && "
-                "chmod 644 /var/lib/acme/live/*/fullchain; "
-                "fi",
-            ],
-        )
         _configure_remote_venv_with_chatmaild(self.config)
         configure_remote_units(self.config.mail_domain, self.units)
 
@@ -496,17 +458,18 @@ class ChatmailDeployer(Deployer):
         ("iroh", None, None),
     ]
 
-    def __init__(self, mail_domain):
-        self.mail_domain = mail_domain
+    def __init__(self, config):
+        self.config = config
+        self.mail_domain = config.mail_domain
 
     def install(self):
-        server.shell(
-            name="Fix broken packages",
-            commands=["apt-get install -f -y"],
-        )
-        server.shell(
-            name="Enable universe repository",
-            commands=["add-apt-repository -y universe || true"],
+        files.put(
+            name="Disable installing recommended packages globally",
+            src=BytesIO(b'APT::Install-Recommends "false";\n'),
+            dest="/etc/apt/apt.conf.d/00InstallRecommends",
+            user="root",
+            group="root",
+            mode="644",
         )
         apt.update(name="apt update", cache_time=24 * 3600)
         apt.upgrade(name="upgrade apt packages", auto_remove=True)
@@ -520,12 +483,18 @@ class ChatmailDeployer(Deployer):
             name="Install rsync",
             packages=["rsync"],
         )
-        apt.packages(
-            name="Ensure cron is installed",
-            packages=["cron"],
-        )
 
     def configure(self):
+        # metadata crashes if the mailboxes dir does not exist
+        files.directory(
+            name="Ensure vmail mailbox directory exists",
+            path=str(self.config.mailboxes_dir),
+            user="vmail",
+            group="vmail",
+            mode="700",
+            present=True,
+        )
+
         # This file is used by auth proxy.
         # https://wiki.debian.org/EtcMailName
         server.shell(
@@ -563,66 +532,106 @@ class GithashDeployer(Deployer):
         except Exception:
             git_diff = ""
         files.put(
-            name="Upload chatmail relay git commiit hash",
+            name="Upload chatmail relay git commit hash",
             src=StringIO(git_hash + git_diff),
             dest="/etc/chatmail-version",
             mode="700",
         )
 
 
-def deploy_chatmail(config_path: Path, disable_mail: bool) -> None:
+def get_tls_deployer(config, mail_domain):
+    """Select the appropriate TLS deployer based on config."""
+    tls_domains = [mail_domain, f"mta-sts.{mail_domain}", f"www.{mail_domain}"]
+
+    if config.tls_cert_mode == "acme":
+        return AcmetoolDeployer(config.acme_email, tls_domains)
+    elif config.tls_cert_mode == "self":
+        return SelfSignedTlsDeployer(mail_domain)
+    elif config.tls_cert_mode == "external":
+        return ExternalTlsDeployer(config.tls_cert_path, config.tls_key_path)
+    else:
+        raise ValueError(f"Unknown tls_cert_mode: {config.tls_cert_mode}")
+
+
+def deploy_chatmail(config_path: Path, disable_mail: bool, website_only: bool) -> None:
     """Deploy a chat-mail instance.
 
     :param config_path: path to chatmail.ini
     :param disable_mail: whether to disable postfix & dovecot
+    :param website_only: if True, only deploy the website
     """
     config = read_config(config_path)
     check_config(config)
     mail_domain = config.mail_domain
 
+    if website_only:
+        Deployment().perform_stages([WebsiteDeployer(config)])
+        return
+
     if host.get_fact(Port, port=53) != "unbound":
         files.line(
             name="Add 9.9.9.9 to resolv.conf",
             path="/etc/resolv.conf",
-            line="nameserver 9.9.9.9",
+            # Guard against resolv.conf missing a trailing newline (SolusVM bug).
+            line="\nnameserver 9.9.9.9",
         )
 
-    port_services = [
-        (["master", "smtpd"], 25),
-        (["unbound", "systemd-resolve", "systemd-resolved"], 53),
-        ("acmetool", 80),
-        (["imap-login", "dovecot"], 143),
-        ("nginx", 443),
-        (["master", "smtpd"], 465),
-        (["master", "smtpd"], 587),
-        (["imap-login", "dovecot"], 993),
-        ("iroh-relay", 3340),
-        ("nginx", 8443),
-        (["master", "smtpd"], config.postfix_reinject_port),
-        (["master", "smtpd"], config.postfix_reinject_port_incoming),
-        ("filtermail", config.filtermail_smtp_port),
-        ("filtermail", config.filtermail_smtp_port_incoming),
-    ]
-    for service, port in port_services:
-        print(f"Checking if port {port} is available for {service}...")
-        running_service = host.get_fact(Port, port=port)
-        if running_service:
-            if running_service not in service:
-                Out().red(
-                    f"Deploy failed: port {port} is occupied by: {running_service}"
-                )
-                exit(1)
+    # Check if mtail_address interface is available (if configured)
+    if config.mtail_address and config.mtail_address not in ('127.0.0.1', '::1', 'localhost'):
+        ipv4_addrs = host.get_fact(hardware.Ipv4Addrs)
+        all_addresses = [addr for addrs in ipv4_addrs.values() for addr in addrs]
+        if config.mtail_address not in all_addresses:
+            Out().red(f"Deploy failed: mtail_address {config.mtail_address} is not available (VPN up?).\n")
+            exit(1)
 
-    tls_domains = [mail_domain]
+    if not os.environ.get("CHATMAIL_NOPORTCHECK"):
+        port_services = [
+            (["master", "smtpd"], 25),
+            ("unbound", 53),
+        ]
+        if config.tls_cert_mode == "acme":
+            port_services.append(("acmetool", 402))
+        port_services += [
+            (["imap-login", "dovecot"], 143),
+            # acmetool previously listened on port 80,
+            # so don't complain during upgrade that moved it to port 402
+            # and gave the port to nginx.
+            (["acmetool", "nginx"], 80),
+            ("nginx", 443),
+            (["master", "smtpd"], 465),
+            (["master", "smtpd"], 587),
+            (["imap-login", "dovecot"], 993),
+            ("iroh-relay", 3340),
+            ("mtail", 3903),
+            ("stats", 3904),
+            ("nginx", 8443),
+            (["master", "smtpd"], config.postfix_reinject_port),
+            (["master", "smtpd"], config.postfix_reinject_port_incoming),
+            ("filtermail", config.filtermail_smtp_port),
+            ("filtermail", config.filtermail_smtp_port_incoming),
+        ]
+        for service, port in port_services:
+            print(f"Checking if port {port} is available for {service}...")
+            running_service = host.get_fact(Port, port=port)
+            services = [service] if isinstance(service, str) else service
+            if running_service:
+                if running_service not in services:
+                    Out().red(
+                        f"Deploy failed: port {port} is occupied by: {running_service}"
+                    )
+                    exit(1)
+
+    tls_deployer = get_tls_deployer(config, mail_domain)
 
     all_deployers = [
-        ChatmailDeployer(mail_domain),
+        ChatmailDeployer(config),
         LegacyRemoveDeployer(),
+        FiltermailDeployer(),
         JournaldDeployer(),
-        UnboundDeployer(),
+        UnboundDeployer(config),
         TurnDeployer(mail_domain),
         IrohDeployer(config.enable_iroh_relay),
-        AcmetoolDeployer(config.acme_email, tls_domains),
+        tls_deployer,
         WebsiteDeployer(config),
         ChatmailVenvDeployer(config),
         MtastsDeployer(),

cmdeploy/src/cmdeploy/dns.py

@@ -1,25 +1,36 @@
 import datetime
-import importlib
-
-from jinja2 import Template
 
 from . import remote
 
 
+def parse_zone_records(text):
+    """Yield ``(name, ttl, rtype, rdata)`` from standard BIND-format text."""
+    for raw_line in text.splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith(";"):
+            continue
+        try:
+            name, ttl, _in, rtype, rdata = line.split(None, 4)
+        except ValueError:
+            raise ValueError(f"Bad zone record line: {line!r}") from None
+        name = name.rstrip(".")
+        yield name, ttl, rtype.upper(), rdata
+
+
 def get_initial_remote_data(sshexec, mail_domain):
     return sshexec.logged(
         call=remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=mail_domain)
     )
 
 
-def check_initial_remote_data(remote_data, *, print=print):
+def check_initial_remote_data(remote_data, *, strict_tls=True, print=print):
     mail_domain = remote_data["mail_domain"]
     if not remote_data["A"] and not remote_data["AAAA"]:
         print(f"Missing A and/or AAAA DNS records for {mail_domain}!")
-    elif remote_data["MTA_STS"] != f"{mail_domain}.":
+    elif strict_tls and remote_data["MTA_STS"] != f"{mail_domain}.":
         print("Missing MTA-STS CNAME record:")
         print(f"mta-sts.{mail_domain}.   CNAME  {mail_domain}.")
-    elif remote_data["WWW"] != f"{mail_domain}.":
+    elif strict_tls and remote_data["WWW"] != f"{mail_domain}.":
         print("Missing www CNAME record:")
         print(f"www.{mail_domain}.   CNAME  {mail_domain}.")
     else:
@@ -31,13 +42,39 @@ def get_filled_zone_file(remote_data):
     if not sts_id:
         remote_data["sts_id"] = datetime.datetime.now().strftime("%Y%m%d%H%M")
 
-    template = importlib.resources.files(__package__).joinpath("chatmail.zone.j2")
-    content = template.read_text()
-    zonefile = Template(content).render(**remote_data)
-    lines = [x.strip() for x in zonefile.split("\n") if x.strip()]
+    d = remote_data["mail_domain"]
+
+    def append_record(name, rtype, rdata, ttl=3600):
+        lines.append(f"{name:<40} {ttl:<6} IN  {rtype:<5}  {rdata}")
+
+    lines = ["; Required DNS entries"]
+    if remote_data.get("A"):
+        append_record(f"{d}.", "A", remote_data["A"])
+    if remote_data.get("AAAA"):
+        append_record(f"{d}.", "AAAA", remote_data["AAAA"])
+    append_record(f"{d}.", "MX", f"10 {d}.")
+    if remote_data.get("strict_tls"):
+        append_record(f"_mta-sts.{d}.", "TXT", f'"v=STSv1; id={remote_data["sts_id"]}"')
+        append_record(f"mta-sts.{d}.", "CNAME", f"{d}.")
+    append_record(f"www.{d}.", "CNAME", f"{d}.")
+    lines.append(remote_data["dkim_entry"])
     lines.append("")
-    zonefile = "\n".join(lines)
-    return zonefile
+    lines.append("; Recommended DNS entries")
+    append_record(f"{d}.", "TXT", '"v=spf1 a ~all"')
+    append_record(f"_dmarc.{d}.", "TXT", '"v=DMARC1;p=reject;adkim=s;aspf=s"')
+    if remote_data.get("acme_account_url"):
+        append_record(
+            f"{d}.",
+            "CAA",
+            f'0 issue "letsencrypt.org;accounturi={remote_data["acme_account_url"]}"',
+        )
+    append_record(f"_adsp._domainkey.{d}.", "TXT", '"dkim=discardable"')
+    append_record(f"_submission._tcp.{d}.", "SRV", f"0 1 587 {d}.")
+    append_record(f"_submissions._tcp.{d}.", "SRV", f"0 1 465 {d}.")
+    append_record(f"_imap._tcp.{d}.", "SRV", f"0 1 143 {d}.")
+    append_record(f"_imaps._tcp.{d}.", "SRV", f"0 1 993 {d}.")
+    lines.append("")
+    return "\n".join(lines)
 
 
 def check_full_zone(sshexec, remote_data, out, zonefile) -> int:
@@ -58,7 +95,8 @@ def check_full_zone(sshexec, remote_data, out, zonefile) -> int:
         returncode = 1
     if remote_data.get("dkim_entry") in required_diff:
         out(
-            "If the DKIM entry above does not work with your DNS provider, you can try this one:\n"
+            "If the DKIM entry above does not work with your DNS provider,"
+            " you can try this one:\n"
         )
         out(remote_data.get("web_dkim_entry") + "\n")
     if recommended_diff:

cmdeploy/src/cmdeploy/dovecot/auth.conf

@@ -4,7 +4,7 @@ iterate_prefix = userdb/
 
 default_pass_scheme = plain
 # %E escapes characters " (double quote), ' (single quote) and \ (backslash) with \ (backslash).
-# See <https://doc.dovecot.org/configuration_manual/config_file/config_variables/#modifiers>
+# See <https://doc.dovecot.org/2.3/configuration_manual/config_file/config_variables/#modifiers>
 # for documentation.
 #
 # We escape user-provided input and use double quote as a separator.

cmdeploy/src/cmdeploy/dovecot/deployer.py

@@ -1,16 +1,31 @@
+import io
+import urllib.request
+
 from chatmaild.config import Config
 from pyinfra import host
-from pyinfra.facts.server import Arch, LinuxDistribution, Sysctl
-from pyinfra.facts.systemd import SystemdEnabled
+from pyinfra.facts.deb import DebPackages
+from pyinfra.facts.server import Arch, Command, Sysctl
 from pyinfra.operations import apt, files, server, systemd
 
 from cmdeploy.basedeploy import (
     Deployer,
     activate_remote_units,
+    blocked_service_startup,
     configure_remote_units,
     get_resource,
 )
 
+DOVECOT_VERSION = "2.3.21+dfsg1-3"
+
+DOVECOT_SHA256 = {
+    ("core", "amd64"): "dd060706f52a306fa863d874717210b9fe10536c824afe1790eec247ded5b27d",
+    ("core", "arm64"): "e7548e8a82929722e973629ecc40fcfa886894cef3db88f23535149e7f730dc9",
+    ("imapd", "amd64"): "8d8dc6fc00bbb6cdb25d345844f41ce2f1c53f764b79a838eb2a03103eebfa86",
+    ("imapd", "arm64"): "178fa877ddd5df9930e8308b518f4b07df10e759050725f8217a0c1fb3fd707f",
+    ("lmtpd", "amd64"): "2f69ba5e35363de50962d42cccbfe4ed8495265044e244007d7ccddad77513ab",
+    ("lmtpd", "arm64"): "89f52fb36524f5877a177dff4a713ba771fd3f91f22ed0af7238d495e143b38f",
+}
+
 
 class DovecotDeployer(Deployer):
     daemon_reload = False
@@ -22,10 +37,34 @@ class DovecotDeployer(Deployer):
 
     def install(self):
         arch = host.get_fact(Arch)
-        if not "dovecot.service" in host.get_fact(SystemdEnabled):
-            _install_dovecot_package("core", arch)
-            _install_dovecot_package("imapd", arch)
-            _install_dovecot_package("lmtpd", arch)
+        with blocked_service_startup():
+            debs = []
+            for pkg in ("core", "imapd", "lmtpd"):
+                deb = _download_dovecot_package(pkg, arch)
+                if deb:
+                    debs.append(deb)
+            if debs:
+                deb_list = " ".join(debs)
+                server.shell(
+                    name="Install dovecot packages",
+                    commands=[
+                        f"dpkg --force-confdef --force-confold -i {deb_list} 2> /dev/null || true",
+                        "DEBIAN_FRONTEND=noninteractive apt-get -y --fix-broken install",
+                        f"dpkg --force-confdef --force-confold -i {deb_list}",
+                    ],
+                )
+        files.put(
+            name="Pin dovecot packages to block Debian dist-upgrades",
+            src=io.StringIO(
+                "Package: dovecot-*\n"
+                "Pin: version *\n"
+                "Pin-Priority: -1\n"
+            ),
+            dest="/etc/apt/preferences.d/pin-dovecot",
+            user="root",
+            group="root",
+            mode="644",
+        )
 
     def configure(self):
         configure_remote_units(self.config.mail_domain, self.units)
@@ -37,7 +76,7 @@ class DovecotDeployer(Deployer):
         restart = False if self.disable_mail else self.need_restart
 
         systemd.service(
-            name="disable dovecot for now"
+            name="Disable dovecot for now"
             if self.disable_mail
             else "Start and enable Dovecot",
             service="dovecot.service",
@@ -49,79 +88,60 @@ class DovecotDeployer(Deployer):
         self.need_restart = False
 
 
-def _install_dovecot_package(package: str, arch: str):
-    distro = host.get_fact(LinuxDistribution)
-    is_old_debian = False
-    if distro:
-        distro_id = str(distro.get("id", "")).lower()
-        distro_name = str(distro.get("name", "")).lower()
-        major_version = str(distro.get("major_version", "0"))
-        
-        if "debian" in distro_id or "debian" in distro_name:
-            try:
-                # Handle cases where major_version might be '11.13'
-                m_ver = major_version.split(".")[0]
-                if m_ver.isdigit() and 0 < int(m_ver) < 12:
-                    is_old_debian = True
-            except (ValueError, TypeError, IndexError):
-                pass
-        # Fallback for systems where major_version might not be parsed correctly but name contains 'bullseye'
-        if "bullseye" in distro_name or "buster" in distro_name:
-            is_old_debian = True
+def _pick_url(primary, fallback):
+    try:
+        req = urllib.request.Request(primary, method="HEAD")
+        urllib.request.urlopen(req, timeout=10)
+        return primary
+    except Exception:
+        return fallback
 
-    if is_old_debian:
-        apt.packages(
-            name=f"Install system dovecot-{package}",
-            packages=[f"dovecot-{package}"],
-            update=True,
-        )
-        return
 
+def _download_dovecot_package(package: str, arch: str):
+    """Download a dovecot .deb if needed, return its path (or None)."""
     arch = "amd64" if arch == "x86_64" else arch
     arch = "arm64" if arch == "aarch64" else arch
-    url = f"https://download.delta.chat/dovecot/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
-    deb_filename = "/root/" + url.split("/")[-1]
 
-    match (package, arch):
-        case ("core", "amd64"):
-            sha256 = "dd060706f52a306fa863d874717210b9fe10536c824afe1790eec247ded5b27d"
-        case ("core", "arm64"):
-            sha256 = "e7548e8a82929722e973629ecc40fcfa886894cef3db88f23535149e7f730dc9"
-        case ("imapd", "amd64"):
-            sha256 = "8d8dc6fc00bbb6cdb25d345844f41ce2f1c53f764b79a838eb2a03103eebfa86"
-        case ("imapd", "arm64"):
-            sha256 = "178fa877ddd5df9930e8308b518f4b07df10e759050725f8217a0c1fb3fd707f"
-        case ("lmtpd", "amd64"):
-            sha256 = "2f69ba5e35363de50962d42cccbfe4ed8495265044e244007d7ccddad77513ab"
-        case ("lmtpd", "arm64"):
-            sha256 = "89f52fb36524f5877a177dff4a713ba771fd3f91f22ed0af7238d495e143b38f"
-        case _:
-            apt.packages(packages=[f"dovecot-{package}"])
-            return
+    pkg_name = f"dovecot-{package}"
+    sha256 = DOVECOT_SHA256.get((package, arch))
+    if sha256 is None:
+        apt.packages(packages=[pkg_name])
+        return None
+
+    installed_versions = host.get_fact(DebPackages).get(pkg_name, [])
+    if DOVECOT_VERSION in installed_versions:
+        return None
+
+    url_version = DOVECOT_VERSION.replace("+", "%2B")
+    deb_base = f"{pkg_name}_{url_version}_{arch}.deb"
+    primary_url = f"https://download.delta.chat/dovecot/{deb_base}"
+    fallback_url = f"https://github.com/chatmail/dovecot/releases/download/upstream%2F{url_version}/{deb_base}"
+    url = _pick_url(primary_url, fallback_url)
+    deb_filename = f"/root/{deb_base}"
 
     files.download(
-        name=f"Download dovecot-{package}",
+        name=f"Download {pkg_name}",
         src=url,
         dest=deb_filename,
         sha256sum=sha256,
         cache_time=60 * 60 * 24 * 365 * 10,  # never redownload the package
     )
 
-    # Use a shell command to try installing the custom .deb and fallback if it fails.
-    # This prevents the whole deployment from failing if custom dovecot is not compatible.
-    server.shell(
-        name=f"Install dovecot-{package} (custom or system fallback)",
-        commands=[
-            f"if ! dpkg -i {deb_filename}; then "
-            f"echo 'HEY: dovecot the custom is not installed, we install your os main one' >&2; "
-            f"DEBIAN_FRONTEND=noninteractive apt-get install -f -y; "
-            f"DEBIAN_FRONTEND=noninteractive apt-get install -y dovecot-{package}; "
-            f"fi"
-        ],
+    return deb_filename
+
+
+def _can_set_inotify_limits() -> bool:
+    is_container = (
+        host.get_fact(
+            Command,
+            "systemd-detect-virt --container --quiet 2>/dev/null && echo yes || true",
+        )
+        == "yes"
     )
+    return not is_container
 
 
-def _configure_dovecot(config: Config, debug: bool = False) -> (bool, bool):
+def _configure_dovecot(config: Config, debug: bool = False) -> tuple[bool, bool]:
     """Configures Dovecot IMAP server."""
     need_restart = False
     daemon_reload = False
@@ -137,13 +157,6 @@ def _configure_dovecot(config: Config, debug: bool = False) -> (bool, bool):
         disable_ipv6=config.disable_ipv6,
     )
     need_restart |= main_config.changed
-    files.directory(
-        name="Ensure mailboxes directory exists",
-        path=str(config.mailboxes_dir),
-        user="vmail",
-        group="vmail",
-        mode="750",
-    )
     auth_config = files.put(
         src=get_resource("dovecot/auth.conf"),
         dest="/etc/dovecot/auth.conf",
@@ -161,27 +174,27 @@ def _configure_dovecot(config: Config, debug: bool = False) -> (bool, bool):
     )
     need_restart |= lua_push_notification_script.changed
 
-    # as per https://doc.dovecot.org/configuration_manual/os/
+    # as per https://doc.dovecot.org/2.3/configuration_manual/os/
     # it is recommended to set the following inotify limits
-    try:
-        sysctls = host.get_fact(Sysctl)
-    except Exception:
-        sysctls = None
-
-    if sysctls:
-        for name in ("max_user_instances", "max_user_watches"):
-            key = f"fs.inotify.{name}"
-            if sysctls.get(key, 0) > 65535:
-                # Skip updating limits if already sufficient
-                # (enables running in incus containers where sysctl readonly)
-                continue
-            server.sysctl(
-                name=f"Change {key}",
-                key=key,
-                value=65535,
-                persist=True,
-                _ignore_errors=True,
+    can_modify = _can_set_inotify_limits()
+    for name in ("max_user_instances", "max_user_watches"):
+        key = f"fs.inotify.{name}"
+        value = host.get_fact(Sysctl)[key]
+        if value > 65534:
+            continue
+        if not can_modify:
+            print(
+                "\n!!!! refusing to attempt sysctl setting in containers\n"
+                f"!!!! dovecot: sysctl {key!r}={value}, should be >65534 for production setups\n"
+                "!!!!"
             )
+            continue
+        server.sysctl(
+            name=f"Change {key}",
+            key=key,
+            value=65535,
+            persist=True,
+        )
 
     timezone_env = files.line(
         name="Set TZ environment variable",
@@ -189,13 +202,7 @@ def _configure_dovecot(config: Config, debug: bool = False) -> (bool, bool):
         line="TZ=:/etc/localtime",
     )
     need_restart |= timezone_env.changed
-    files.directory(
-        name="Ensure dovecot.service.d directory exists",
-        path="/etc/systemd/system/dovecot.service.d",
-        user="root",
-        group="root",
-        mode="755",
-    )
+
     restart_conf = files.put(
         name="dovecot: restart automatically on failure",
         src=get_resource("service/10_restart.conf"),
@@ -203,4 +210,11 @@ def _configure_dovecot(config: Config, debug: bool = False) -> (bool, bool):
     )
     daemon_reload |= restart_conf.changed
 
+    # Validate dovecot configuration before restart
+    if need_restart:
+        server.shell(
+            name="Validate dovecot configuration",
+            commands=["doveconf -n >/dev/null"],
+        )
+
     return need_restart, daemon_reload

cmdeploy/src/cmdeploy/dovecot/dovecot.conf.j2

@@ -1,7 +1,7 @@
 ## Dovecot configuration file
 
 {% if disable_ipv6 %}
-listen = *
+listen = 0.0.0.0
 {% endif %}
 
 protocols = imap lmtp
@@ -26,7 +26,7 @@ default_client_limit = 20000
 # Increase number of logged in IMAP connections.
 # Each connection is handled by a separate `imap` process.
 # `imap` process should have `client_limit=1` as described in
-# <https://doc.dovecot.org/configuration_manual/service_configuration/#service-limits>
+# <https://doc.dovecot.org/2.3/configuration_manual/service_configuration/#service-limits>
 # so each logged in IMAP session will need its own `imap` process.
 #
 # If this limit is reached,
@@ -44,11 +44,11 @@ mail_server_comment = Chatmail server
 
 # `zlib` enables compressing messages stored in the maildir.
 # See
-# <https://doc.dovecot.org/configuration_manual/zlib_plugin/>
+# <https://doc.dovecot.org/2.3/configuration_manual/zlib_plugin/>
 # for documentation.
 #
 # quota plugin documentation:
-# <https://doc.dovecot.org/configuration_manual/quota_plugin/>
+# <https://doc.dovecot.org/2.3/configuration_manual/quota_plugin/>
 mail_plugins = zlib quota
 
 imap_capability = +XDELTAPUSH XCHATMAIL
@@ -125,13 +125,13 @@ plugin {
 
 protocol lmtp {
   # notify plugin is a dependency of push_notification plugin:
-  # <https://doc.dovecot.org/settings/plugin/notify-plugin/>
+  # <https://doc.dovecot.org/2.3/settings/plugin/notify-plugin/>
   #
   # push_notification plugin documentation:
-  # <https://doc.dovecot.org/configuration_manual/push_notification/>
+  # <https://doc.dovecot.org/2.3/configuration_manual/push_notification/>
   #
   # mail_lua and push_notification_lua are needed for Lua push notification handler.
-  # <https://doc.dovecot.org/configuration_manual/push_notification/#configuration>
+  # <https://doc.dovecot.org/2.3/configuration_manual/push_notification/#configuration>
   mail_plugins = $mail_plugins mail_lua notify push_notification push_notification_lua
 }
 
@@ -154,7 +154,7 @@ plugin {
 
 # push_notification configuration
 plugin {
-  # <https://doc.dovecot.org/configuration_manual/push_notification/#lua-lua>
+  # <https://doc.dovecot.org/2.3/configuration_manual/push_notification/#lua-lua>
   push_notification_driver = lua:file=/etc/dovecot/push_notification.lua
 }
 
@@ -168,6 +168,8 @@ service lmtp {
   }
 }
 
+lmtp_add_received_header = no
+
 service auth {
   unix_listener /var/spool/postfix/private/auth {
     mode = 0660
@@ -226,10 +228,10 @@ service anvil {
 }
 
 ssl = required
-ssl_cert = </var/lib/acme/live/{{ config.mail_domain }}/fullchain
-ssl_key = </var/lib/acme/live/{{ config.mail_domain }}/privkey
+ssl_cert = <{{ config.tls_cert_path }}
+ssl_key = <{{ config.tls_key_path }}
 ssl_dh = </usr/share/dovecot/dh.pem
-ssl_min_protocol = TLSv1.2
+ssl_min_protocol = TLSv1.3
 ssl_prefer_server_ciphers = yes
 
 
@@ -277,3 +279,156 @@ service imap-hibernate {
   }
 }
 {% endif %}
+
+{% if config.mtail_address %}
+#
+# Dovecot Statistics
+#
+# OpenMetrics endpoint at http://{{- config.mtail_address}}:3904/metrics
+service stats {
+  inet_listener http {
+    port = 3904
+    address = {{- config.mtail_address}}
+  }
+}
+
+# IMAP Command Metrics
+# - Bytes in/out for compression efficiency analysis
+# - Lock wait time for contention debugging
+# - Grouped by command name and reply state
+metric imap_command {
+  filter = event=imap_command_finished
+  fields = bytes_in bytes_out lock_wait_usecs running_usecs
+  group_by = cmd_name tagged_reply_state
+}
+
+# Duration buckets for latency histograms (base 10: 10us, 100us, 1ms, 10ms, 100ms, 1s, 10s, 100s)
+metric imap_command_duration {
+  filter = event=imap_command_finished
+  group_by = cmd_name duration:exponential:1:8:10
+}
+
+# Slow command outliers (>1 second = 1000000 usecs)
+# Useful for alerting without high cardinality
+metric imap_command_slow {
+  filter = event=imap_command_finished AND duration>1000000 AND NOT cmd_name=IDLE
+  group_by = cmd_name
+}
+
+# IDLE-specific Metrics
+
+metric imap_idle {
+  filter = event=imap_command_finished AND cmd_name=IDLE
+  fields = bytes_in bytes_out running_usecs
+  group_by = tagged_reply_state
+}
+
+metric imap_idle_duration {
+  filter = event=imap_command_finished AND cmd_name=IDLE
+  # Base 10: 100ms to 27h (covers short wakeups to long idle sessions)
+  group_by = duration:exponential:5:11:10
+}
+
+metric imap_idle_commands {
+  filter = event=imap_command_finished AND cmd_name=IDLE
+  group_by = tagged_reply_state
+}
+
+metric imap_idle_failed {
+  filter = event=imap_command_finished AND cmd_name=IDLE AND NOT tagged_reply_state=OK
+}
+
+# Hibernation Metrics (requires imap_hibernate_timeout)
+
+metric imap_hibernated {
+  filter = event=imap_client_hibernated
+}
+
+metric imap_hibernated_failed {
+  filter = event=imap_client_hibernated AND error=*
+}
+
+metric imap_unhibernated {
+  filter = event=imap_client_unhibernated
+  fields = hibernation_usecs
+}
+
+metric imap_unhibernated_reason {
+  filter = event=imap_client_unhibernated
+  group_by = reason
+  fields = hibernation_usecs
+}
+
+metric imap_unhibernated_reason_sleep {
+  filter = event=imap_client_unhibernated
+  group_by = reason hibernation_usecs:exponential:4:8:10
+}
+
+metric imap_unhibernated_failed {
+  filter = event=imap_client_unhibernated AND error=*
+}
+
+# Hibernation duration buckets (how long clients stayed hibernated)
+# Base 10: 100ms to 27h
+metric imap_hibernation_duration {
+  filter = event=imap_client_unhibernated
+  group_by = reason duration:exponential:5:11:10
+}
+
+# Authentication / Login Metrics
+
+metric auth_request {
+  filter = event=auth_request_finished
+  group_by = success
+}
+
+metric auth_request_duration {
+  filter = event=auth_request_finished
+  group_by = success duration:exponential:2:6:10
+}
+
+metric auth_failed {
+  filter = event=auth_request_finished AND success=no
+}
+
+# Passdb cache effectiveness
+metric auth_passdb {
+  filter = event=auth_passdb_request_finished
+  group_by = result cache
+}
+
+# Master login (post-auth userdb lookup)
+metric auth_master_login {
+  filter = event=auth_master_client_login_finished
+}
+
+metric auth_master_login_failed {
+  filter = event=auth_master_client_login_finished AND error=*
+}
+
+# Mail Delivery (LMTP) - affects IDLE wakeup latency
+
+metric mail_delivery {
+  filter = event=mail_delivery_finished
+}
+
+metric mail_delivery_duration {
+  filter = event=mail_delivery_finished
+  group_by = duration:exponential:3:7:10
+}
+
+metric mail_delivery_failed {
+  filter = event=mail_delivery_finished AND error=*
+}
+
+# Connection Events
+
+metric client_connected {
+  filter = event=client_connection_connected AND category="service:imap"
+}
+
+metric client_disconnected {
+  filter = event=client_connection_disconnected AND category="service:imap"
+  fields = bytes_in bytes_out
+}
+{% endif %}

cmdeploy/src/cmdeploy/external/deployer.py

@@ -0,0 +1,67 @@
+import io
+
+from pyinfra import host
+from pyinfra.facts.files import File
+from pyinfra.operations import files, systemd
+
+from cmdeploy.basedeploy import Deployer, get_resource
+
+
+class ExternalTlsDeployer(Deployer):
+    """Expects TLS certificates to be managed on the server.
+
+    Validates that the configured certificate and key files
+    exist on the remote host.  Installs a systemd path unit
+    that watches the certificate file and automatically
+    restarts/reloads affected services when it changes.
+    """
+
+    def __init__(self, cert_path, key_path):
+        self.cert_path = cert_path
+        self.key_path = key_path
+
+    def configure(self):
+        # Verify cert and key exist on the remote host using pyinfra facts.
+        for path in (self.cert_path, self.key_path):
+            info = host.get_fact(File, path=path)
+            if info is None:
+                raise Exception(f"External TLS file not found on server: {path}")
+
+        # Deploy the .path unit (templated with the cert path).
+        # pkg=__package__ is required here because the resource files
+        # live in cmdeploy.external, not the default cmdeploy package.
+        source = get_resource("tls-cert-reload.path.f", pkg=__package__)
+        content = source.read_text().format(cert_path=self.cert_path).encode()
+
+        path_unit = files.put(
+            name="Upload tls-cert-reload.path",
+            src=io.BytesIO(content),
+            dest="/etc/systemd/system/tls-cert-reload.path",
+            user="root",
+            group="root",
+            mode="644",
+        )
+
+        service_unit = files.put(
+            name="Upload tls-cert-reload.service",
+            src=get_resource("tls-cert-reload.service", pkg=__package__),
+            dest="/etc/systemd/system/tls-cert-reload.service",
+            user="root",
+            group="root",
+            mode="644",
+        )
+
+        if path_unit.changed or service_unit.changed:
+            self.need_restart = True
+
+    def activate(self):
+        systemd.service(
+            name="Enable tls-cert-reload path watcher",
+            service="tls-cert-reload.path",
+            running=True,
+            enabled=True,
+            restarted=self.need_restart,
+            daemon_reload=self.need_restart,
+        )
+        # No explicit reload needed here: dovecot/nginx read the cert
+        # on startup, and the .path watcher handles live changes.

cmdeploy/src/cmdeploy/external/tls-cert-reload.path.f

@@ -0,0 +1,15 @@
+# Watch the TLS certificate file for changes.
+# When the cert is updated (e.g. renewed by an external process),
+# this triggers tls-cert-reload.service to reload the affected services.
+#
+# NOTE: changes to the certificates are not detected if they cross bind-mount boundaries. 
+# After cert renewal, you must then trigger the reload explicitly:
+#   systemctl start tls-cert-reload.service
+[Unit]
+Description=Watch TLS certificate for changes
+
+[Path]
+PathChanged={cert_path}
+
+[Install]
+WantedBy=multi-user.target

cmdeploy/src/cmdeploy/external/tls-cert-reload.service

@@ -0,0 +1,15 @@
+# Reload services that cache the TLS certificate.
+#
+# dovecot: caches the cert at startup; reload re-reads SSL certs
+#          without dropping existing connections.
+# nginx:   caches the cert at startup; reload gracefully picks up
+#          the new cert for new connections.
+# postfix: reads the cert fresh on each TLS handshake,
+#          does NOT need a reload/restart.
+[Unit]
+Description=Reload TLS services after certificate change
+
+[Service]
+Type=oneshot
+ExecStart=/bin/systemctl try-reload-or-restart dovecot
+ExecStart=/bin/systemctl try-reload-or-restart nginx

cmdeploy/src/cmdeploy/filtermail/deployer.py

@@ -0,0 +1,52 @@
+from pyinfra import facts, host
+from pyinfra.operations import files, systemd
+
+from cmdeploy.basedeploy import Deployer, get_resource
+
+
+class FiltermailDeployer(Deployer):
+    services = ["filtermail", "filtermail-incoming"]
+    bin_path = "/usr/local/bin/filtermail"
+    config_path = "/usr/local/lib/chatmaild/chatmail.ini"
+
+    def __init__(self):
+        self.need_restart = False
+
+    def install(self):
+        arch = host.get_fact(facts.server.Arch)
+        url = f"https://github.com/chatmail/filtermail/releases/download/v0.6.1/filtermail-{arch}"
+        sha256sum = {
+            "x86_64": "48b3fb80c092d00b9b0a0ef77a8673496da3b9aed5ec1851e1df936d5589d62f",
+            "aarch64": "c65bd5f45df187d3d65d6965a285583a3be0f44a6916ff12909ff9a8d702c22e",
+        }[arch]
+        self.need_restart |= files.download(
+            name="Download filtermail",
+            src=url,
+            sha256sum=sha256sum,
+            dest=self.bin_path,
+            mode="755",
+        ).changed
+
+    def configure(self):
+        for service in self.services:
+            self.need_restart |= files.template(
+                src=get_resource(f"filtermail/{service}.service.j2"),
+                dest=f"/etc/systemd/system/{service}.service",
+                user="root",
+                group="root",
+                mode="644",
+                bin_path=self.bin_path,
+                config_path=self.config_path,
+            ).changed
+
+    def activate(self):
+        for service in self.services:
+            systemd.service(
+                name=f"Start and enable {service}",
+                service=f"{service}.service",
+                running=True,
+                enabled=True,
+                restarted=self.need_restart,
+                daemon_reload=True,
+            )
+        self.need_restart = False

cmdeploy/src/cmdeploy/filtermail/filtermail-incoming.service.j2

@@ -2,11 +2,10 @@
 Description=Incoming Chatmail Postfix before queue filter 
 
 [Service]
-ExecStart={execpath} {config_path} incoming
+ExecStart={{ bin_path }} {{ config_path }} incoming
 Restart=always
 RestartSec=30
 User=vmail
 
 [Install]
 WantedBy=multi-user.target
-

cmdeploy/src/cmdeploy/filtermail/filtermail.service.j2

@@ -2,7 +2,7 @@
 Description=Outgoing Chatmail Postfix before queue filter
 
 [Service]
-ExecStart={execpath} {config_path} outgoing
+ExecStart={{ bin_path }} {{ config_path }} outgoing
 Restart=always
 RestartSec=30
 User=vmail

cmdeploy/src/cmdeploy/metrics.cron.j2

@@ -1 +0,0 @@
-*/5 * * * * root {{ config.execpath }} {{ config.mailboxes_dir }} >/var/www/html/metrics

cmdeploy/src/cmdeploy/mtail/delivered_mail.mtail

@@ -44,21 +44,37 @@ counter warning_count
 }
 
 
-counter filtered_mail_count
+counter filtered_outgoing_mail_count
 
-counter encrypted_mail_count
-/Filtering encrypted mail\./ {
-  encrypted_mail_count++
-  filtered_mail_count++
+counter outgoing_encrypted_mail_count
+/Outgoing: Filtering encrypted mail\./ {
+  outgoing_encrypted_mail_count++
+  filtered_outgoing_mail_count++
 }
 
-counter unencrypted_mail_count
-/Filtering unencrypted mail\./ {
-  unencrypted_mail_count++
-  filtered_mail_count++
+counter outgoing_unencrypted_mail_count
+/Outgoing: Filtering unencrypted mail\./ {
+  outgoing_unencrypted_mail_count++
+  filtered_outgoing_mail_count++
 }
 
+
+counter filtered_incoming_mail_count
+
+counter incoming_encrypted_mail_count
+/Incoming: Filtering encrypted mail\./ {
+  incoming_encrypted_mail_count++
+  filtered_incoming_mail_count++
+}
+
+counter incoming_unencrypted_mail_count
+/Incoming: Filtering unencrypted mail\./ {
+  incoming_unencrypted_mail_count++
+  filtered_incoming_mail_count++
+}
+
+
 counter rejected_unencrypted_mail_count
-/Rejected unencrypted mail\./ {
+/Rejected unencrypted mail/ {
   rejected_unencrypted_mail_count++
 }

cmdeploy/src/cmdeploy/nginx/autoconfig.xml.j2

@@ -1,47 +1,47 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <clientConfig version="1.1">
-  <emailProvider id="{{ config.domain_name }}">
-    <domain>{{ config.domain_name }}</domain>
-    <displayName>{{ config.domain_name }} chatmail</displayName>
-    <displayShortName>{{ config.domain_name }}</displayShortName>
+  <emailProvider id="{{ config.mail_domain }}">
+    <domain>{{ config.mail_domain }}</domain>
+    <displayName>{{ config.mail_domain }} chatmail</displayName>
+    <displayShortName>{{ config.mail_domain }}</displayShortName>
     <incomingServer type="imap">
-      <hostname>{{ config.domain_name }}</hostname>
+      <hostname>{{ config.mail_domain }}</hostname>
       <port>993</port>
       <socketType>SSL</socketType>
       <authentication>password-cleartext</authentication>
       <username>%EMAILADDRESS%</username>
     </incomingServer>
     <incomingServer type="imap">
-      <hostname>{{ config.domain_name }}</hostname>
+      <hostname>{{ config.mail_domain }}</hostname>
       <port>143</port>
       <socketType>STARTTLS</socketType>
       <authentication>password-cleartext</authentication>
       <username>%EMAILADDRESS%</username>
     </incomingServer>
     <incomingServer type="imap">
-      <hostname>{{ config.domain_name }}</hostname>
+      <hostname>{{ config.mail_domain }}</hostname>
       <port>443</port>
       <socketType>SSL</socketType>
       <authentication>password-cleartext</authentication>
       <username>%EMAILADDRESS%</username>
     </incomingServer>
     <outgoingServer type="smtp">
-      <hostname>{{ config.domain_name }}</hostname>
+      <hostname>{{ config.mail_domain }}</hostname>
       <port>465</port>
       <socketType>SSL</socketType>
       <authentication>password-cleartext</authentication>
       <username>%EMAILADDRESS%</username>
     </outgoingServer>
     <outgoingServer type="smtp">
-      <hostname>{{ config.domain_name }}</hostname>
+      <hostname>{{ config.mail_domain }}</hostname>
       <port>587</port>
       <socketType>STARTTLS</socketType>
       <authentication>password-cleartext</authentication>
       <username>%EMAILADDRESS%</username>
     </outgoingServer>
     <outgoingServer type="smtp">
-      <hostname>{{ config.domain_name }}</hostname>
+      <hostname>{{ config.mail_domain }}</hostname>
       <port>443</port>
       <socketType>SSL</socketType>
       <authentication>password-cleartext</authentication>

cmdeploy/src/cmdeploy/nginx/deployer.py

@@ -1,5 +1,5 @@
 from chatmaild.config import Config
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.operations import apt, files, systemd
 
 from cmdeploy.basedeploy import (
     Deployer,
@@ -43,13 +43,6 @@ class NginxDeployer(Deployer):
             name="Install nginx",
             packages=["nginx", "libnginx-mod-stream"],
         )
-        server.shell(
-            name="Remove default nginx configuration",
-            commands=[
-                "rm -f /etc/nginx/sites-enabled/default",
-                "rm -f /etc/nginx/conf.d/default.conf",
-            ],
-        )
 
         files.file("/usr/sbin/policy-rc.d", present=False)
 
@@ -77,7 +70,7 @@ def _configure_nginx(config: Config, debug: bool = False) -> bool:
         user="root",
         group="root",
         mode="644",
-        config={"domain_name": config.mail_domain},
+        config=config,
         disable_ipv6=config.disable_ipv6,
     )
     need_restart |= main_config.changed
@@ -88,7 +81,7 @@ def _configure_nginx(config: Config, debug: bool = False) -> bool:
         user="root",
         group="root",
         mode="644",
-        config={"domain_name": config.mail_domain},
+        config=config,
     )
     need_restart |= autoconfig.changed
 
@@ -98,7 +91,7 @@ def _configure_nginx(config: Config, debug: bool = False) -> bool:
         user="root",
         group="root",
         mode="644",
-        config={"domain_name": config.mail_domain},
+        config=config,
     )
     need_restart |= mta_sts_config.changed
 

cmdeploy/src/cmdeploy/nginx/mta-sts.txt.j2

@@ -1,4 +1,4 @@
 version: STSv1
 mode: enforce
-mx: {{ config.domain_name }}
+mx: {{ config.mail_domain }}
 max_age: 2419200

cmdeploy/src/cmdeploy/nginx/nginx.conf.j2

@@ -42,6 +42,9 @@ stream {
 }
 
 http {
+{% if config.tls_cert_mode == "self" %}
+	limit_req_zone $binary_remote_addr zone=newaccount:10m rate=2r/s;
+{% endif %}
 	sendfile on;
 	tcp_nopush on;
 
@@ -51,10 +54,10 @@ http {
 	include /etc/nginx/mime.types;
 	default_type application/octet-stream;
 
-	ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
+	ssl_protocols TLSv1.2 TLSv1.3;
 	ssl_prefer_server_ciphers on;
-	ssl_certificate /var/lib/acme/live/{{ config.domain_name }}/fullchain;
-	ssl_certificate_key /var/lib/acme/live/{{ config.domain_name }}/privkey;
+	ssl_certificate {{ config.tls_cert_path }};
+	ssl_certificate_key {{ config.tls_key_path }};
 
 	gzip on;
 
@@ -66,26 +69,30 @@ http {
 
 		index index.html index.htm;
 
-		server_name {{ config.domain_name }};
+		server_name {{ config.mail_domain }} www.{{ config.mail_domain }} mta-sts.{{ config.mail_domain }};
 
 		access_log syslog:server=unix:/dev/log,facility=local7;
 
+		location /mxdeliv/ {
+		    proxy_pass http://127.0.0.1:{{ config.filtermail_http_port }};
+		}
+
 		location / {
 			# First attempt to serve request as file, then
 			# as directory, then fall back to displaying a 404.
 			try_files $uri $uri/ =404;
 		}
 
-		location /metrics {
-			default_type text/plain;
-		}
-
 		location /new {
+{% if config.tls_cert_mode != "self" %}
 			if ($request_method = GET) {
 				# Redirect to Delta Chat,
 				# which will in turn do a POST request.
-				return 301 dcaccount:https://{{ config.domain_name }}/new;
+				return 301 dcaccount:https://{{ config.mail_domain }}/new;
 			}
+{% else %}
+			limit_req zone=newaccount burst=5 nodelay;
+{% endif %}
 
 			fastcgi_pass unix:/run/fcgiwrap.socket;
 			include /etc/nginx/fastcgi_params;
@@ -99,9 +106,11 @@ http {
 		#
 		# Redirects are only for browsers.
 		location /cgi-bin/newemail.py {
+{% if config.tls_cert_mode != "self" %}
 			if ($request_method = GET) {
-				return 301 dcaccount:https://{{ config.domain_name }}/new;
+				return 301 dcaccount:https://{{ config.mail_domain }}/new;
 			}
+{% endif %}
 
 			fastcgi_pass unix:/run/fcgiwrap.socket;
 			include /etc/nginx/fastcgi_params;
@@ -132,8 +141,29 @@ http {
 	# Redirect www. to non-www
 	server {
 		listen 127.0.0.1:8443 ssl;
-		server_name www.{{ config.domain_name }};
-		return 301 $scheme://{{ config.domain_name }}$request_uri;
+		server_name www.{{ config.mail_domain }};
+		return 301 $scheme://{{ config.mail_domain }}$request_uri;
 		access_log syslog:server=unix:/dev/log,facility=local7;
 	}
+
+	server {
+		listen 80;
+		{% if not disable_ipv6 %}
+		listen [::]:80;
+		{% endif %}
+
+		{% if config.tls_cert_mode == "acme" %}
+		location /.well-known/acme-challenge/ {
+			proxy_pass http://acmetool;
+		}
+		{% endif %}
+
+		return 301 https://$host$request_uri;
+	}
+
+	{% if config.tls_cert_mode == "acme" %}
+	upstream acmetool {
+		server 127.0.0.1:402;
+	}
+	{% endif %}
 }

cmdeploy/src/cmdeploy/opendkim/deployer.py

@@ -37,21 +37,15 @@ class OpendkimDeployer(Deployer):
         )
         need_restart |= main_config.changed
 
-        screen_script = files.put(
-            src=get_resource("opendkim/screen.lua"),
-            dest="/etc/opendkim/screen.lua",
-            user="root",
-            group="root",
-            mode="644",
+        screen_script = files.file(
+            path="/etc/opendkim/screen.lua",
+            present=False,
         )
         need_restart |= screen_script.changed
 
-        final_script = files.put(
-            src=get_resource("opendkim/final.lua"),
-            dest="/etc/opendkim/final.lua",
-            user="root",
-            group="root",
-            mode="644",
+        final_script = files.file(
+            path="/etc/opendkim/final.lua",
+            present=False,
         )
         need_restart |= final_script.changed
 
@@ -109,6 +103,13 @@ class OpendkimDeployer(Deployer):
         )
         need_restart |= service_file.changed
 
+        files.file(
+            name="chown opendkim: /etc/dkimkeys/opendkim.private",
+            path="/etc/dkimkeys/opendkim.private",
+            user="opendkim",
+            group="opendkim",
+        )
+
         self.need_restart = need_restart
 
     def activate(self):

cmdeploy/src/cmdeploy/opendkim/final.lua

@@ -1,42 +0,0 @@
-mtaname = odkim.get_mtasymbol(ctx, "{daemon_name}")
-if mtaname == "ORIGINATING" then
-	-- Outgoing message will be signed,
-	-- no need to look for signatures.
-	return nil
-end
-
-nsigs = odkim.get_sigcount(ctx)
-if nsigs == nil then
-	return nil
-end
-
-local valid = false
-local error_msg = "No valid DKIM signature found."
-for i = 1, nsigs do
-	sig = odkim.get_sighandle(ctx, i - 1)
-	sigres = odkim.sig_result(sig)
-
-	-- All signatures that do not correspond to From: 
-	-- were ignored in screen.lua and return sigres -1.
-	-- 
-	-- Any valid signature that was not ignored like this
-	-- means the message is acceptable.
-	if sigres == 0 then
-		valid = true
-    else
-        error_msg = "DKIM signature is invalid, error code " .. tostring(sigres) .. ", search https://github.com/trusteddomainproject/OpenDKIM/blob/master/libopendkim/dkim.h#L108"
-	end
-end
-
-if valid then
-	-- Strip all DKIM-Signature headers after successful validation
-	-- Delete in reverse order to avoid index shifting.
-	for i = nsigs, 1, -1 do
-		odkim.del_header(ctx, "DKIM-Signature", i)
-	end
-else
-	odkim.set_reply(ctx, "554", "5.7.1", error_msg)
-	odkim.set_result(ctx, SMFIS_REJECT)
-end
-
-return nil

cmdeploy/src/cmdeploy/opendkim/opendkim.conf

@@ -45,12 +45,6 @@ SignHeaders *,+autocrypt,+content-type
 # Default is empty.
 OversignHeaders from,reply-to,subject,date,to,cc,resent-date,resent-from,resent-sender,resent-to,resent-cc,in-reply-to,references,list-id,list-help,list-unsubscribe,list-subscribe,list-post,list-owner,list-archive,autocrypt
 
-# Script to ignore signatures that do not correspond to the From: domain.
-ScreenPolicyScript /etc/opendkim/screen.lua
-
-# Script to reject mails without a valid DKIM signature.
-FinalPolicyScript /etc/opendkim/final.lua
-
 # In Debian, opendkim runs as user "opendkim". A umask of 007 is required when
 # using a local socket with MTAs that access the socket as a non-privileged
 # user (for example, Postfix). You may need to add user "postfix" to group

cmdeploy/src/cmdeploy/opendkim/screen.lua

@@ -1,21 +0,0 @@
--- Ignore signatures that do not correspond to the From: domain.
-
-from_domain = odkim.get_fromdomain(ctx)
-if from_domain == nil then
-	return nil
-end
-
-n = odkim.get_sigcount(ctx)
-if n == nil then
-	return nil
-end
-
-for i = 1, n do
-	sig = odkim.get_sighandle(ctx, i - 1)
-	sig_domain = odkim.sig_getdomain(sig)
-	if from_domain ~= sig_domain then
-		odkim.sig_ignore(sig)
-	end
-end
-
-return nil

cmdeploy/src/cmdeploy/postfix/deployer.py

@@ -1,4 +1,4 @@
-from pyinfra.operations import apt, files, systemd, server
+from pyinfra.operations import apt, files, server, systemd
 
 from cmdeploy.basedeploy import Deployer, get_resource
 
@@ -52,19 +52,29 @@ class PostfixDeployer(Deployer):
         )
         need_restart |= header_cleanup.changed
 
-        # Transport map that discards messages to nine.testrun.org
-        transport_map = files.put(
-            src=get_resource("postfix/discard-nine.map"),
-            dest="/etc/postfix/discard-nine.map",
+        lmtp_header_cleanup = files.put(
+            src=get_resource("postfix/lmtp_header_cleanup"),
+            dest="/etc/postfix/lmtp_header_cleanup",
             user="root",
             group="root",
             mode="644",
         )
-        need_restart |= transport_map.changed
-        if transport_map.changed:
+        need_restart |= lmtp_header_cleanup.changed
+
+        tls_policy_map = files.put(
+            name="Upload SMTP TLS Policy that accepts self-signed certificates for IP-only hosts",
+            src=get_resource("postfix/smtp_tls_policy_map"),
+            dest="/etc/postfix/smtp_tls_policy_map",
+            user="root",
+            group="root",
+            mode="644",
+        )
+        need_restart |= tls_policy_map.changed
+        if tls_policy_map.changed:
             server.shell(
-                commands=["postmap /etc/postfix/discard-nine.map"],
+                commands=["postmap /etc/postfix/smtp_tls_policy_map"],
             )
+
         # Login map that 1:1 maps email address to login.
         login_map = files.put(
             src=get_resource("postfix/login_map"),
@@ -74,19 +84,23 @@ class PostfixDeployer(Deployer):
             mode="644",
         )
         need_restart |= login_map.changed
-        files.directory(
-            name="Ensure postfix@.service.d directory exists",
-            path="/etc/systemd/system/postfix@.service.d",
-            user="root",
-            group="root",
-            mode="755",
-        )
+
         restart_conf = files.put(
             name="postfix: restart automatically on failure",
             src=get_resource("service/10_restart.conf"),
             dest="/etc/systemd/system/postfix@.service.d/10_restart.conf",
         )
         self.daemon_reload = restart_conf.changed
+
+        # Validate postfix configuration before restart
+        if need_restart:
+            server.shell(
+                name="Validate postfix configuration",
+                # Extract stderr and quit with error if non-zero
+                commands=[
+                    """bash -c 'w=$(postconf 2>&1 >/dev/null); [[ -z "$w" ]] || { echo "$w"; false; }'"""
+                ],
+            )
         self.need_restart = need_restart
 
     def activate(self):

cmdeploy/src/cmdeploy/postfix/discard-nine.map

@@ -1,2 +0,0 @@
-nine.testrun.org discard:
-* :

cmdeploy/src/cmdeploy/postfix/lmtp_header_cleanup

@@ -0,0 +1,3 @@
+/^DKIM-Signature:/            IGNORE
+/^Authentication-Results:/            IGNORE
+/^Received:/            IGNORE

cmdeploy/src/cmdeploy/postfix/main.cf.j2

@@ -15,8 +15,8 @@ readme_directory = no
 compatibility_level = 3.6
 
 # TLS parameters
-smtpd_tls_cert_file=/var/lib/acme/live/{{ config.mail_domain }}/fullchain
-smtpd_tls_key_file=/var/lib/acme/live/{{ config.mail_domain }}/privkey
+smtpd_tls_cert_file={{ config.tls_cert_path }}
+smtpd_tls_key_file={{ config.tls_key_path }}
 smtpd_tls_security_level=may
 
 smtp_tls_CApath=/etc/ssl/certs
@@ -25,9 +25,9 @@ smtp_tls_security_level=verify
 # <https://www.postfix.org/postconf.5.html#smtp_tls_servername>
 smtp_tls_servername = hostname
 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
-smtp_tls_policy_maps = inline:{nauta.cu=may}
-smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
-smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
+smtp_tls_policy_maps = regexp:/etc/postfix/smtp_tls_policy_map
+smtp_tls_protocols = >=TLSv1.2
+smtp_tls_mandatory_protocols = >=TLSv1.2
 
 # Disable anonymous cipher suites
 # and known insecure algorithms.
@@ -64,7 +64,20 @@ alias_database = hash:/etc/aliases
 mydestination =
 
 relayhost = 
+{% if disable_ipv6 %}
+mynetworks = 127.0.0.0/8
+{% else %}
 mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+{% endif %}
+{% if config.addr_v4 %}
+smtp_bind_address = {{ config.addr_v4 }}
+{% endif %}
+{% if config.addr_v6 %}
+smtp_bind_address6 = {{ config.addr_v6 }}
+{% endif %}
+{% if config.addr_v4 or config.addr_v6 %}
+smtp_bind_address_enforce = yes
+{% endif %}
 mailbox_size_limit = 0
 message_size_limit = {{config.max_message_size}}
 recipient_delimiter = +
@@ -75,16 +88,30 @@ inet_protocols = ipv4
 inet_protocols = all
 {% endif %}
 
+# Postfix does not try IPv4 and IPv6 connections
+# concurrently as of version 3.7.11.
+#
+# When relay has both A (IPv4) and AAAA (IPv6) records,
+# but broken IPv6 connectivity,
+# every second message is delayed by the connection timeout
+# <https://www.postfix.org/postconf.5.html#smtp_connect_timeout>
+# which defaults to 30 seconds. Reducing timeouts is not a solution
+# as this will result in a failure to connect to slow servers.
+#
+# As a workaround we always prefer IPv4 when it is available.
+# 
+# The setting is documented at
+# <https://www.postfix.org/postconf.5.html#smtp_address_preference>
+smtp_address_preference=ipv4
+
 virtual_transport = lmtp:unix:private/dovecot-lmtp
 virtual_mailbox_domains = {{ config.mail_domain }}
+lmtp_header_checks = regexp:/etc/postfix/lmtp_header_cleanup
 
 mua_client_restrictions = permit_sasl_authenticated, reject
 mua_sender_restrictions = reject_sender_login_mismatch, permit_sasl_authenticated, reject
 mua_helo_restrictions = permit_mynetworks, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, permit
 
-# Discard messages to nine.testrun.org
-transport_maps = hash:/etc/postfix/discard-nine.map
-
 # 1:1 map MAIL FROM to SASL login name.
 smtpd_sender_login_maps = regexp:/etc/postfix/login_map
 

cmdeploy/src/cmdeploy/postfix/master.cf.j2

@@ -10,17 +10,17 @@
 #               (yes)   (yes)   (no)    (never) (100)
 # ==========================================================================
 {% if debug == true %}
-smtp      inet  n       -       n       -       -       smtpd -v
+smtp      inet  n       -       y       -       -       smtpd -v
 {%- else %}
-smtp      inet  n       -       n       -       -       smtpd 
+smtp      inet  n       -       y       -       -       smtpd 
 {%- endif %}
   -o smtpd_tls_security_level=encrypt
-  -o smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3,!TLSv1,!TLSv1.1
+  -o smtpd_tls_mandatory_protocols=>=TLSv1.2
   -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port_incoming }}
-submission inet n       -       n       -       5000    smtpd
+submission inet n       -       y       -       5000    smtpd
   -o syslog_name=postfix/submission
   -o smtpd_tls_security_level=encrypt
-  -o smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3,!TLSv1,!TLSv1.1
+  -o smtpd_tls_mandatory_protocols=>=TLSv1.3
   -o smtpd_sasl_auth_enable=yes
   -o smtpd_sasl_type=dovecot
   -o smtpd_sasl_path=private/auth
@@ -33,11 +33,11 @@ submission inet n       -       n       -       5000    smtpd
   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
   -o smtpd_client_connection_count_limit=1000
   -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port }}
-smtps     inet  n       -       n       -       5000    smtpd
+smtps     inet  n       -       y       -       5000    smtpd
   -o syslog_name=postfix/smtps
   -o smtpd_tls_wrappermode=yes
   -o smtpd_tls_security_level=encrypt
-  -o smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3,!TLSv1,!TLSv1.1
+  -o smtpd_tls_mandatory_protocols=>=TLSv1.3
   -o smtpd_sasl_auth_enable=yes
   -o smtpd_sasl_type=dovecot
   -o smtpd_sasl_path=private/auth
@@ -51,12 +51,15 @@ smtps     inet  n       -       n       -       5000    smtpd
   -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port }}
 #628       inet  n       -       y       -       -       qmqpd
 pickup    unix  n       -       y       60      1       pickup
+ -o cleanup_service_name=signlocal
 cleanup   unix  n       -       y       -       0       cleanup
 qmgr      unix  n       -       n       300     1       qmgr
 #qmgr     unix  n       -       n       300     1       oqmgr
 tlsmgr    unix  -       -       y       1000?   1       tlsmgr
 rewrite   unix  -       -       y       -       -       trivial-rewrite
 bounce    unix  -       -       y       -       0       bounce
+  -o internal_mail_filter_classes=bounce
+  -o cleanup_service_name=signlocal
 defer     unix  -       -       y       -       0       bounce
 trace     unix  -       -       y       -       0       bounce
 verify    unix  -       -       y       -       1       verify
@@ -86,7 +89,6 @@ filter    unix -        n       n       -       -       lmtp
 # Local SMTP server for reinjecting incoming filtered mail 
 127.0.0.1:{{ config.postfix_reinject_port_incoming }} inet  n       -       n       -       100      smtpd
   -o syslog_name=postfix/reinject_incoming
-#  -o smtpd_milters=unix:opendkim/opendkim.sock
 
 # Cleanup `Received` headers for authenticated mail
 # to avoid leaking client IP.
@@ -101,3 +103,9 @@ filter    unix -        n       n       -       -       lmtp
 # cannot send unprotected Subject.
 authclean unix  n       -       -       -       0       cleanup
   -o header_checks=regexp:/etc/postfix/submission_header_cleanup
+
+# Signs locally generated bounce messages.
+# These can't be signed using smtpd as they are not non-smtpd.
+signlocal unix  n       -       -       -       0       cleanup
+  -o milter_macro_daemon_name=ORIGINATING
+  -o non_smtpd_milters=unix:opendkim/opendkim.sock

cmdeploy/src/cmdeploy/postfix/smtp_tls_policy_map

@@ -0,0 +1,3 @@
+/^\[[^]]+\]$/ encrypt
+/^_/          encrypt
+/^nauta\.cu$/    may

cmdeploy/src/cmdeploy/remote/rdns.py

@@ -53,13 +53,14 @@ def get_dkim_entry(mail_domain, pre_command, dkim_selector):
             print=log_progress,
         )
     except CalledProcessError:
-        return
+        return None, None
     dkim_value_raw = f"v=DKIM1;k=rsa;p={dkim_pubkey};s=email;t=s"
     dkim_value = '" "'.join(re.findall(".{1,255}", dkim_value_raw))
     web_dkim_value = "".join(re.findall(".{1,255}", dkim_value_raw))
+    name = f"{dkim_selector}._domainkey.{mail_domain}."
     return (
-        f'{dkim_selector}._domainkey.{mail_domain}. TXT "{dkim_value}"',
-        f'{dkim_selector}._domainkey.{mail_domain}. TXT "{web_dkim_value}"',
+        f'{name:<40} 3600   IN  TXT    "{dkim_value}"',
+        f'{name:<40} 3600   IN  TXT    "{web_dkim_value}"',
     )
 
 
@@ -77,7 +78,7 @@ def query_dns(typ, domain):
     ns = soa[0][4]
 
     # Query authoritative nameserver directly to bypass DNS cache.
-    res = shell(f"dig -r -q {domain} -t {typ} +short", print=log_progress)
+    res = shell(f"dig @{ns} -r -q {domain} -t {typ} +short", print=log_progress)
     return next((line for line in res.split("\n") if not line.startswith(";")), "")
 
 
@@ -94,7 +95,7 @@ def check_zonefile(zonefile, verbose=True):
         if not zf_line.strip() or zf_line.startswith(";"):
             continue
         print(f"dns-checking {zf_line!r}") if verbose else log_progress("")
-        zf_domain, zf_typ, zf_value = zf_line.split(maxsplit=2)
+        zf_domain, _ttl, _in, zf_typ, zf_value = zf_line.split(None, 4)
         zf_domain = zf_domain.rstrip(".")
         zf_value = zf_value.strip()
         query_value = query_dns(zf_typ, zf_domain)

cmdeploy/src/cmdeploy/remote/rshell.py

@@ -40,5 +40,5 @@ def dovecot_recalc_quota(user):
     #
     for line in output.split("\n"):
         parts = line.split()
-        if parts[2] == "STORAGE":
+        if len(parts) >= 6 and parts[2] == "STORAGE":
             return dict(value=int(parts[3]), limit=int(parts[4]), percent=int(parts[5]))

cmdeploy/src/cmdeploy/run.py

@@ -14,8 +14,9 @@ def main():
         importlib.resources.files("cmdeploy").joinpath("../../../chatmail.ini"),
     )
     disable_mail = bool(os.environ.get("CHATMAIL_DISABLE_MAIL"))
+    website_only = bool(os.environ.get("CHATMAIL_WEBSITE_ONLY"))
 
-    deploy_chatmail(config_path, disable_mail)
+    deploy_chatmail(config_path, disable_mail, website_only)
 
 
 if pyinfra.is_cli:

cmdeploy/src/cmdeploy/selfsigned/deployer.py

@@ -0,0 +1,54 @@
+import shlex
+
+from pyinfra.operations import apt, server
+
+from cmdeploy.basedeploy import Deployer
+
+
+def openssl_selfsigned_args(domain, cert_path, key_path, days=36500):
+    """Return the openssl argument list for a self-signed certificate.
+
+    The certificate uses an EC P-256 key with SAN entries for *domain*,
+    ``www.<domain>`` and ``mta-sts.<domain>``.
+    """
+    return [
+        "openssl", "req", "-x509",
+        "-newkey", "ec", "-pkeyopt", "ec_paramgen_curve:P-256",
+        "-noenc", "-days", str(days),
+        "-keyout", str(key_path),
+        "-out", str(cert_path),
+        "-subj", f"/CN={domain}",
+        # Mark as end-entity cert so it cannot be used as a CA to sign others.
+        "-addext", "basicConstraints=critical,CA:FALSE",
+        "-addext", "extendedKeyUsage=serverAuth,clientAuth",
+        "-addext",
+        f"subjectAltName=DNS:{domain},DNS:www.{domain},DNS:mta-sts.{domain}",
+    ]
+
+
+class SelfSignedTlsDeployer(Deployer):
+    """Generates a self-signed TLS certificate for all chatmail endpoints."""
+
+    def __init__(self, mail_domain):
+        self.mail_domain = mail_domain
+        self.cert_path = "/etc/ssl/certs/mailserver.pem"
+        self.key_path = "/etc/ssl/private/mailserver.key"
+
+    def install(self):
+        apt.packages(
+            name="Install openssl",
+            packages=["openssl"],
+        )
+
+    def configure(self):
+        args = openssl_selfsigned_args(
+            self.mail_domain, self.cert_path, self.key_path,
+        )
+        cmd = shlex.join(args)
+        server.shell(
+            name="Generate self-signed TLS certificate if not present",
+            commands=[f"[ -f {self.cert_path} ] || {cmd}"],
+        )
+
+    def activate(self):
+        pass

cmdeploy/src/cmdeploy/service/chatmail-fsreport.service.f

@@ -5,5 +5,5 @@ After=network.target
 [Service]
 Type=oneshot
 User=vmail
-ExecStart=/usr/local/lib/chatmaild/venv/bin/chatmail-fsreport /usr/local/lib/chatmaild/chatmail.ini 
+ExecStart=/usr/local/lib/chatmaild/venv/bin/chatmail-fsreport /usr/local/lib/chatmaild/chatmail.ini
 

cmdeploy/src/cmdeploy/service/chatmail-metadata.service.f

@@ -4,11 +4,10 @@ Description=Chatmail dict proxy for IMAP METADATA
 [Service]
 ExecStart={execpath} /run/chatmail-metadata/metadata.socket {config_path}
 Restart=always
-RestartSec=30
+RestartSec=5
 User=vmail
 RuntimeDirectory=chatmail-metadata
-RuntimeDirectoryMode=0755
-UMask=0022
+UMask=0077
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/doveauth.service.f

@@ -7,8 +7,7 @@ Restart=always
 RestartSec=30
 User=vmail
 RuntimeDirectory=doveauth
-RuntimeDirectoryMode=0755
-UMask=0022
+UMask=0077
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/lastlogin.service.f

@@ -7,7 +7,6 @@ Restart=always
 RestartSec=30
 User=vmail
 RuntimeDirectory=chatmail-lastlogin
-RuntimeDirectoryMode=0755
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/sshexec.py

@@ -49,8 +49,9 @@ class SSHExec:
     RemoteError = execnet.RemoteError
     FuncError = FuncError
 
-    def __init__(self, host, verbose=False, python="python3", timeout=60):
-        self.gateway = execnet.makegateway(f"ssh=root@{host}//python={python}")
+    def __init__(self, host, verbose=False, python="python3", timeout=60, ssh_options=None):
+        ssh_options = f"{ssh_options.strip()} " if ssh_options is not None else ""
+        self.gateway = execnet.makegateway(f"ssh={ssh_options}root@{host}//python={python}")
         self._remote_cmdloop_channel = bootstrap_remote(self.gateway, remote)
         self.timeout = timeout
         self.verbose = verbose
@@ -85,16 +86,31 @@ class SSHExec:
 
 
 class LocalExec:
+    FuncError = FuncError
+
     def __init__(self, verbose=False, docker=False):
         self.verbose = verbose
         self.docker = docker
 
+    def __call__(self, call, kwargs=None, log_callback=None):
+        if kwargs is None:
+            kwargs = {}
+        return call(**kwargs)
+
     def logged(self, call, kwargs: dict):
+        title = call.__doc__
+        if not title:
+            title = call.__name__
         where = "locally"
         if self.docker:
             if call == remote.rdns.perform_initial_checks:
                 kwargs["pre_command"] = "docker exec chatmail "
                 where = "in docker"
         if self.verbose:
-            print(f"Running {where}: {call.__name__}(**{kwargs})")
-        return call(**kwargs)
+            print_stderr(f"Running {where}: {title}(**{kwargs})")
+            return self(call, kwargs, log_callback=print_stderr)
+        else:
+            print_stderr(title, end="")
+            res = self(call, kwargs, log_callback=remote.rshell.log_progress)
+            print_stderr()
+            return res

cmdeploy/src/cmdeploy/tests/data/zftest.zone

@@ -1,17 +1,18 @@
-; Required DNS entries for chatmail servers
-zftest.testrun.org.                   A     135.181.204.127
-zftest.testrun.org.                   AAAA  2a01:4f9:c012:52f4::1
-zftest.testrun.org.                   MX 10 zftest.testrun.org.
-_mta-sts.zftest.testrun.org.          TXT "v=STSv1; id=202403211706"
-mta-sts.zftest.testrun.org.           CNAME zftest.testrun.org.
-www.zftest.testrun.org.               CNAME zftest.testrun.org.
-opendkim._domainkey.zftest.testrun.org. TXT "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoYt82CVUyz2ouaqjX2kB+5J80knAyoOU3MGU5aWppmwUwwTvj/oSTSpkc5JMtVTRmKKr8NUDWAL1Yw7dfGqqPHdHfwwjS3BIvDzYx+hzgtz62RnfNgV+/2MAoNpfX7cAFIHdRzEHNtwugc3RDLquqPoupAE3Y2YRw2T5zG5fILh4vwIcJZL5Uq6B92j8wwJqOex" "33n+vm1NKQ9rxo/UsHAmZlJzpooXcG/4igTBxJyJlamVSRR6N7Nul1v//YJb7J6v2o0iPHW6uE0StzKaPPNC2IVosSRFbD9H2oqppltptFSNPlI0E+t0JBWHem6YK7xcugiO3ImMCaaU8g6Jt/wIDAQAB;s=email;t=s"
+; Required DNS entries
+zftest.testrun.org.                      3600   IN  A      135.181.204.127
+zftest.testrun.org.                      3600   IN  AAAA   2a01:4f9:c012:52f4::1
+zftest.testrun.org.                      3600   IN  MX     10 zftest.testrun.org.
+_mta-sts.zftest.testrun.org.             3600   IN  TXT    "v=STSv1; id=202403211706"
+mta-sts.zftest.testrun.org.              3600   IN  CNAME  zftest.testrun.org.
+www.zftest.testrun.org.                  3600   IN  CNAME  zftest.testrun.org.
+opendkim._domainkey.zftest.testrun.org.  3600   IN  TXT    "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoYt82CVUyz2ouaqjX2kB+5J80knAyoOU3MGU5aWppmwUwwTvj/oSTSpkc5JMtVTRmKKr8NUDWAL1Yw7dfGqqPHdHfwwjS3BIvDzYx+hzgtz62RnfNgV+/2MAoNpfX7cAFIHdRzEHNtwugc3RDLquqPoupAE3Y2YRw2T5zG5fILh4vwIcJZL5Uq6B92j8wwJqOex" "33n+vm1NKQ9rxo/UsHAmZlJzpooXcG/4igTBxJyJlamVSRR6N7Nul1v//YJb7J6v2o0iPHW6uE0StzKaPPNC2IVosSRFbD9H2oqppltptFSNPlI0E+t0JBWHem6YK7xcugiO3ImMCaaU8g6Jt/wIDAQAB;s=email;t=s"
+
 ; Recommended DNS entries
-_submission._tcp.zftest.testrun.org.  SRV 0 1 587 zftest.testrun.org.
-_submissions._tcp.zftest.testrun.org. SRV 0 1 465 zftest.testrun.org.
-_imap._tcp.zftest.testrun.org.        SRV 0 1 143 zftest.testrun.org.
-_imaps._tcp.zftest.testrun.org.       SRV 0 1 993 zftest.testrun.org.
-zftest.testrun.org.                   CAA 0 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1371472956"
-zftest.testrun.org.                   TXT "v=spf1 a:zftest.testrun.org ~all"
-_dmarc.zftest.testrun.org.            TXT "v=DMARC1;p=reject;adkim=s;aspf=s"
-_adsp._domainkey.zftest.testrun.org.  TXT "dkim=discardable"
+zftest.testrun.org.                      3600   IN  TXT    "v=spf1 a ~all"
+_dmarc.zftest.testrun.org.               3600   IN  TXT    "v=DMARC1;p=reject;adkim=s;aspf=s"
+zftest.testrun.org.                      3600   IN  CAA    0 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1371472956"
+_adsp._domainkey.zftest.testrun.org.     3600   IN  TXT    "dkim=discardable"
+_submission._tcp.zftest.testrun.org.     3600   IN  SRV    0 1 587 zftest.testrun.org.
+_submissions._tcp.zftest.testrun.org.    3600   IN  SRV    0 1 465 zftest.testrun.org.
+_imap._tcp.zftest.testrun.org.           3600   IN  SRV    0 1 143 zftest.testrun.org.
+_imaps._tcp.zftest.testrun.org.          3600   IN  SRV    0 1 993 zftest.testrun.org.

cmdeploy/src/cmdeploy/tests/online/benchmark.py

@@ -41,9 +41,9 @@ class TestDC:
 
         def dc_ping_pong():
             chat.send_text("ping")
-            msg = ac2._evtracker.wait_next_incoming_message()
-            msg.chat.send_text("pong")
-            ac1._evtracker.wait_next_incoming_message()
+            msg = ac2.wait_for_incoming_msg()
+            msg.get_snapshot().chat.send_text("pong")
+            ac1.wait_for_incoming_msg()
 
         benchmark(dc_ping_pong, 5)
 
@@ -55,6 +55,6 @@ class TestDC:
             for i in range(10):
                 chat.send_text(f"hello {i}")
             for i in range(10):
-                ac2._evtracker.wait_next_incoming_message()
+                ac2.wait_for_incoming_msg()
 
-        benchmark(dc_send_10_receive_10, 5)
+        benchmark(dc_send_10_receive_10, 5, cooldown="auto")

cmdeploy/src/cmdeploy/tests/online/test_0_login.py

@@ -89,7 +89,9 @@ def test_concurrent_logins_same_account(
         assert login_results.get()
 
 
-def test_no_vrfy(chatmail_config):
+def test_no_vrfy(cmfactory, chatmail_config):
+    ac = cmfactory.get_online_account()
+    addr = ac.get_config("addr")
     domain = chatmail_config.mail_domain
 
     s = smtplib.SMTP(domain)
@@ -98,7 +100,7 @@ def test_no_vrfy(chatmail_config):
     s.putcmd("vrfy", f"wrongaddress@{chatmail_config.mail_domain}")
     result = s.getreply()
     print(result)
-    s.putcmd("vrfy", f"echo@{chatmail_config.mail_domain}")
+    s.putcmd("vrfy", addr)
     result2 = s.getreply()
     print(result2)
     assert result[0] == result2[0] == 252

cmdeploy/src/cmdeploy/tests/online/test_0_qr.py

@@ -1,3 +1,4 @@
+import pytest
 import requests
 
 from cmdeploy.genqr import gen_qr_png_data
@@ -8,18 +9,33 @@ def test_gen_qr_png_data(maildomain):
     assert data
 
 
+@pytest.mark.filterwarnings("ignore::urllib3.exceptions.InsecureRequestWarning")
 def test_fastcgi_working(maildomain, chatmail_config):
     url = f"https://{maildomain}/new"
     print(url)
-    res = requests.post(url)
+    verify = chatmail_config.tls_cert_mode == "acme"
+    res = requests.post(url, verify=verify)
     assert maildomain in res.json().get("email")
     assert len(res.json().get("password")) > chatmail_config.password_min_length
 
 
-def test_newemail_configure(maildomain, rpc):
+@pytest.mark.filterwarnings("ignore::urllib3.exceptions.InsecureRequestWarning")
+def test_newemail_configure(maildomain, rpc, chatmail_config):
     """Test configuring accounts by scanning a QR code works."""
     url = f"DCACCOUNT:https://{maildomain}/new"
     for i in range(3):
         account_id = rpc.add_account()
-        rpc.set_config_from_qr(account_id, url)
-        rpc.configure(account_id)
+        if chatmail_config.tls_cert_mode == "self":
+            # deltachat core's rustls rejects self-signed HTTPS certs during
+            # set_config_from_qr, so fetch credentials via requests instead
+            res = requests.post(f"https://{maildomain}/new", verify=False)
+            data = res.json()
+            rpc.add_or_update_transport(account_id, {
+                "addr": data["email"],
+                "password": data["password"],
+                "imapServer": maildomain,
+                "smtpServer": maildomain,
+                "certificateChecks": "acceptInvalidCertificates",
+            })
+        else:
+            rpc.add_transport_from_qr(account_id, url)

cmdeploy/src/cmdeploy/tests/online/test_1_basic.py

@@ -7,13 +7,14 @@ import time
 import pytest
 
 from cmdeploy import remote
-from cmdeploy.sshexec import SSHExec
+from cmdeploy.cmdeploy import get_sshexec
+from cmdeploy.sshexec import FuncError
 
 
 class TestSSHExecutor:
     @pytest.fixture(scope="class")
     def sshexec(self, sshdomain):
-        return SSHExec(sshdomain)
+        return get_sshexec(sshdomain)
 
     def test_ls(self, sshexec):
         out = sshexec(call=remote.rdns.shell, kwargs=dict(command="ls"))
@@ -27,6 +28,7 @@ class TestSSHExecutor:
         assert res["A"] or res["AAAA"]
 
     def test_logged(self, sshexec, maildomain, capsys):
+        sshexec.verbose = False
         sshexec.logged(
             remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
         )
@@ -52,6 +54,8 @@ class TestSSHExecutor:
                 remote.rdns.perform_initial_checks,
                 kwargs=dict(mail_domain=None),
             )
+        except AssertionError:
+            pass
         except sshexec.FuncError as e:
             assert "rdns.py" in str(e)
             assert "AssertionError" in str(e)
@@ -83,10 +87,8 @@ def test_remote(remote, imap_or_smtp):
 
 
 def test_use_two_chatmailservers(cmfactory, maildomain2):
-    ac1 = cmfactory.new_online_configuring_account(cache=False)
-    cmfactory.switch_maildomain(maildomain2)
-    ac2 = cmfactory.new_online_configuring_account(cache=False)
-    cmfactory.bring_accounts_online()
+    ac1 = cmfactory.get_online_account()
+    ac2 = cmfactory.get_online_account(domain=maildomain2)
     cmfactory.get_accepted_chat(ac1, ac2)
     domain1 = ac1.get_config("addr").split("@")[1]
     domain2 = ac2.get_config("addr").split("@")[1]
@@ -116,6 +118,33 @@ def test_reject_forged_from(cmsetup, maildata, gencreds, lp, forgeaddr):
     assert "500" in str(e.value)
 
 
+@pytest.mark.slow
+def test_bounces_are_signed(cmsetup, cmsetup2, maildata, sshdomain2):
+    """Test that bounce messages are dkim signed"""
+
+    dkim_rejects_dir = "/tmp/filtermail-rejected/dkim-verify"
+    sshexec2 = get_sshexec(sshdomain2, ssh_options="-oStrictHostKeyChecking=accept-new")
+    sshexec2(call=remote.rdns.shell, kwargs=dict(command=f"rm -rf {dkim_rejects_dir}"))
+
+    our_user = cmsetup.gen_users(1)[0]
+    other_user = cmsetup2.gen_users(1)[0]
+    msg = maildata("encrypted.eml", from_addr=other_user.addr, to_addr=our_user.addr)
+
+    # exceed the 10kB quota of our_user mailbox to trigger a bounce message.
+    def bounce_received():
+        other_user.smtp.sendmail(
+            from_addr=other_user.addr, to_addrs=[our_user.addr], msg=msg.as_string()
+        )
+        out = sshexec2(call=remote.rdns.shell, kwargs=dict(command=f"journalctl -n 5 -u filtermail-incoming"))
+        assert "Filtering unencrypted mail." in out
+
+    try_n_times(20, bounce_received)
+
+    time.sleep(1)
+    # if bounce was dkim-signed, filtermail shouldn't log the eml.
+    with pytest.raises(FuncError):
+        sshexec2(call=remote.rdns.shell, kwargs=dict(command=f"ls {dkim_rejects_dir}"))
+
 def test_authenticated_from(cmsetup, maildata):
     """Test that envelope FROM must be the same as login."""
     user1, user2, user3 = cmsetup.gen_users(3)
@@ -146,7 +175,7 @@ def test_reject_missing_dkim(cmsetup, maildata, from_addr):
     conn.starttls()
 
     with conn as s:
-        with pytest.raises(smtplib.SMTPDataError, match="No valid DKIM signature"):
+        with pytest.raises(smtplib.SMTPDataError, match="No DKIM signature found"):
             s.sendmail(from_addr=from_addr, to_addrs=recipient.addr, msg=msg)
 
 
@@ -189,12 +218,14 @@ def test_exceed_rate_limit(cmsetup, gencreds, maildata, chatmail_config):
     mail = maildata(
         "encrypted.eml", from_addr=user1.addr, to_addr=user2.addr
     ).as_string()
-    for i in range(chatmail_config.max_user_send_per_minute + 5):
-        print("Sending mail", str(i))
+
+    start = time.time()
+    for i in range(chatmail_config.max_user_send_per_minute * 3):
+        print("Sending mail", str(i + 1), "at", time.time() - start, "s.")
         try:
             user1.smtp.sendmail(user1.addr, [user2.addr], mail)
         except smtplib.SMTPException as e:
-            if i < chatmail_config.max_user_send_per_minute:
+            if i < chatmail_config.max_user_send_burst_size:
                 pytest.fail(f"rate limit was exceeded too early with msg {i}")
             outcome = e.recipients[user2.addr]
             assert outcome[0] == 450
@@ -216,7 +247,7 @@ def test_expunged(remote, chatmail_config):
     ]
     outdated_days = int(chatmail_config.delete_large_after) + 1
     find_cmds.append(
-        "find {chatmail_config.mailboxes_dir} -path '*/cur/*' -mtime +{outdated_days} -size +200k -type f"
+        f"find {chatmail_config.mailboxes_dir} -path '*/cur/*' -mtime +{outdated_days} -size +200k -type f"
     )
     for cmd in find_cmds:
         for line in remote.iter_output(cmd):

cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py

@@ -6,17 +6,19 @@ import imap_tools
 import pytest
 import requests
 
+from cmdeploy.cmdeploy import get_sshexec
 from cmdeploy.remote import rshell
-from cmdeploy.sshexec import SSHExec
 
 
 @pytest.fixture
-def imap_mailbox(cmfactory):
+def imap_mailbox(cmfactory, ssl_context):
     (ac1,) = cmfactory.get_online_accounts(1)
     user = ac1.get_config("addr")
     password = ac1.get_config("mail_pw")
-    mailbox = imap_tools.MailBox(user.split("@")[1])
+    host = user.split("@")[1]
+    mailbox = imap_tools.MailBox(host, ssl_context=ssl_context)
     mailbox.login(user, password)
+    mailbox.dc_ac = ac1
     return mailbox
 
 
@@ -25,6 +27,7 @@ class TestMetadataTokens:
 
     def test_set_get_metadata(self, imap_mailbox):
         "set and get metadata token for an account"
+        time.sleep(5)  # make sure Metadata service had a chance to restart
         client = imap_mailbox.client
         client.send(b'a01 SETMETADATA INBOX (/private/devicetoken "1111" )\n')
         res = client.readline()
@@ -60,8 +63,8 @@ class TestEndToEndDeltaChat:
         chat.send_text("message0")
 
         lp.sec("wait for ac2 to receive message")
-        msg2 = ac2._evtracker.wait_next_incoming_message()
-        assert msg2.text == "message0"
+        msg2 = ac2.wait_for_incoming_msg()
+        assert msg2.get_snapshot().text == "message0"
 
     def test_exceed_quota(
         self, cmfactory, lp, tmpdir, remote, chatmail_config, sshdomain
@@ -89,66 +92,83 @@ class TestEndToEndDeltaChat:
         lp.sec(f"filling remote inbox for {user}")
         fn = f"7743102289.M843172P2484002.c20,S={quota},W=2398:2,"
         path = chatmail_config.mailboxes_dir.joinpath(user, "cur", fn)
-        sshexec = SSHExec(sshdomain)
+        sshexec = get_sshexec(sshdomain)
         sshexec(call=rshell.write_numbytes, kwargs=dict(path=str(path), num=120))
         res = sshexec(call=rshell.dovecot_recalc_quota, kwargs=dict(user=user))
         assert res["percent"] >= 100
 
         lp.sec("ac2: check quota is triggered")
 
-        starting = True
-        for line in remote.iter_output("journalctl -n0 -f -u dovecot"):
-            if starting:
-                chat.send_text("hello")
-                starting = False
+        def send_hello():
+            chat.send_text("hello")
+
+        for line in remote.iter_output(
+            "journalctl -n1 -f -u dovecot", ready=send_hello
+        ):
             if user not in line:
-                # print(line)
                 continue
             if "quota exceeded" in line:
                 return
 
     def test_securejoin(self, cmfactory, lp, maildomain2):
-        ac1 = cmfactory.new_online_configuring_account(cache=False)
-        cmfactory.switch_maildomain(maildomain2)
-        ac2 = cmfactory.new_online_configuring_account(cache=False)
-        cmfactory.bring_accounts_online()
+        ac1 = cmfactory.get_online_account()
+        ac2 = cmfactory.get_online_account(domain=maildomain2)
 
         lp.sec("ac1: create QR code and let ac2 scan it, starting the securejoin")
-        qr = ac1.get_setup_contact_qr()
+        qr = ac1.get_qr_code()
 
         lp.sec("ac2: start QR-code based setup contact protocol")
-        ch = ac2.qr_setup_contact(qr)
+        ch = ac2.secure_join(qr)
         assert ch.id >= 10
-        ac1._evtracker.wait_securejoin_inviter_progress(1000)
+        ac1.wait_for_securejoin_inviter_success()
+
+    def test_dkim_header_stripped(self, cmfactory, maildomain2, lp, imap_mailbox):
+        """Test that if a DC address receives a message, it has no
+        DKIM-Signature and Authentication-Results headers."""
+        ac1 = cmfactory.get_online_account()
+        ac2 = cmfactory.get_online_account(domain=maildomain2)
+        chat = cmfactory.get_accepted_chat(ac1, imap_mailbox.dc_ac)
+        chat.send_text("message0")
+        chat2 = cmfactory.get_accepted_chat(ac2, imap_mailbox.dc_ac)
+        chat2.send_text("message1")
+
+        lp.sec("receive message with ac1...")
+        received = 0
+        while received < 2:
+            msgs = imap_mailbox.fetch()
+            for msg in msgs:
+                lp.sec(f"ac1 received msg from {msg.from_}")
+                received += 1
+                assert "authentication-results" not in msg.headers
+                assert "dkim-signature" not in msg.headers
 
     def test_read_receipts_between_instances(self, cmfactory, lp, maildomain2):
-        ac1 = cmfactory.new_online_configuring_account(cache=False)
-        cmfactory.switch_maildomain(maildomain2)
-        ac2 = cmfactory.new_online_configuring_account(cache=False)
-        cmfactory.bring_accounts_online()
+        ac1 = cmfactory.get_online_account()
+        ac2 = cmfactory.get_online_account(domain=maildomain2)
 
         lp.sec("setup encrypted comms between ac1 and ac2 on different instances")
-        qr = ac1.get_setup_contact_qr()
-        ch = ac2.qr_setup_contact(qr)
+        qr = ac1.get_qr_code()
+        ch = ac2.secure_join(qr)
         assert ch.id >= 10
-        ac1._evtracker.wait_securejoin_inviter_progress(1000)
+        ac1.wait_for_securejoin_inviter_success()
 
         lp.sec("ac1 sends a message and ac2 marks it as seen")
         chat = ac1.create_chat(ac2)
         msg = chat.send_text("hi")
-        m = ac2._evtracker.wait_next_incoming_message()
+        m = ac2.wait_for_incoming_msg()
         m.mark_seen()
         # we can only indirectly wait for mark-seen to cause an smtp-error
         lp.sec("try to wait for markseen to complete and check error states")
         deadline = time.time() + 3.1
         while time.time() < deadline:
-            msgs = m.chat.get_messages()
+            m_snap = m.get_snapshot()
+            msgs = m_snap.chat.get_messages()
             for msg in msgs:
-                assert "error" not in m.get_message_info()
+                assert "error" not in m.get_info()
             time.sleep(1)
 
 
-def test_hide_senders_ip_address(cmfactory):
+def test_hide_senders_ip_address(cmfactory, ssl_context):
     public_ip = requests.get("http://icanhazip.com").content.decode().strip()
     assert ipaddress.ip_address(public_ip)
 
@@ -156,7 +176,12 @@ def test_hide_senders_ip_address(cmfactory):
     chat = cmfactory.get_accepted_chat(user1, user2)
 
     chat.send_text("testing submission header cleanup")
-    user2._evtracker.wait_next_incoming_message()
-    user2.direct_imap.select_folder("Inbox")
-    msg = user2.direct_imap.get_all_messages()[0]
-    assert public_ip not in msg.obj.as_string()
+    user2.wait_for_incoming_msg()
+    addr = user2.get_config("addr")
+    host = addr.split("@")[1]
+    pw = user2.get_config("mail_pw")
+    mailbox = imap_tools.MailBox(host, ssl_context=ssl_context)
+    mailbox.login(addr, pw)
+    msgs = list(mailbox.fetch(mark_seen=False))
+    assert msgs, "expected at least one message"
+    assert public_ip not in msgs[0].obj.as_string()

cmdeploy/src/cmdeploy/tests/online/test_3_status.py

@@ -5,7 +5,11 @@ from cmdeploy.cmdeploy import main
 
 def test_status_cmd(chatmail_config, capsys, request):
     os.chdir(request.config.invocation_params.dir)
-    assert main(["status"]) == 0
+    command = ["status"]
+    if os.getenv("CHATMAIL_SSH"):
+        command.append("--ssh-host")
+        command.append(os.getenv("CHATMAIL_SSH"))
+    assert main(command) == 0
     status_out = capsys.readouterr()
     print(status_out.out)
 

cmdeploy/src/cmdeploy/tests/plugin.py

@@ -1,9 +1,9 @@
 import imaplib
-import io
 import itertools
 import os
 import random
 import smtplib
+import ssl
 import subprocess
 import time
 from pathlib import Path
@@ -34,17 +34,29 @@ def pytest_runtest_setup(item):
             pytest.skip("skipping slow test, use --slow to run")
 
 
-@pytest.fixture(scope="session")
-def chatmail_config(pytestconfig):
-    current = basedir = Path().resolve()
+def _get_chatmail_config():
+    inipath = os.environ.get("CHATMAIL_INI")
+    if inipath:
+        path = Path(inipath).resolve()
+        return read_config(path), path
+
+    current = Path().resolve()
     while 1:
         path = current.joinpath("chatmail.ini").resolve()
         if path.exists():
-            return read_config(path)
+            return read_config(path), path
         if current == current.parent:
             break
         current = current.parent
+    return None, None
 
+
+@pytest.fixture(scope="session")
+def chatmail_config(pytestconfig):
+    config, path = _get_chatmail_config()
+    if config:
+        return config
+    basedir = Path().resolve()
     pytest.skip(f"no chatmail.ini file found in {basedir} or parent dirs")
 
 
@@ -72,10 +84,17 @@ def sshdomain2(maildomain2):
 
 
 def pytest_report_header():
-    domain = os.environ.get("CHATMAIL_DOMAIN")
-    if domain:
-        text = f"chatmail test instance: {domain}"
-        return ["-" * len(text), text, "-" * len(text)]
+    config, path = _get_chatmail_config()
+    domain2 = os.environ.get("CHATMAIL_DOMAIN2", "NOT SET")
+    domain = config.mail_domain if config else "NOT SET"
+    path = path if path else "NOT SET"
+
+    lines = [
+        f"chatmail.ini {domain} location: {path}",
+        f"chatmail2: {domain2}",
+    ]
+    sep = "-" * max(map(len, lines))
+    return [sep, *lines, sep]
 
 
 @pytest.fixture
@@ -90,15 +109,22 @@ def cm_data(request):
 
 
 @pytest.fixture
-def benchmark(request):
-    def bench(func, num, name=None, reportfunc=None):
+def benchmark(request, chatmail_config):
+    def bench(func, num, name=None, reportfunc=None, cooldown=0.0):
         if name is None:
             name = func.__name__
+        if cooldown == "auto":
+            per_minute = max(chatmail_config.max_user_send_per_minute, 1)
+            cooldown = chatmail_config.max_user_send_burst_size * 60 / per_minute
+
         durations = []
         for i in range(num):
             now = time.time()
             func()
             durations.append(time.time() - now)
+            if cooldown > 0 and i + 1 < num:
+                # Keep post-run cooldown out of measured benchmark duration.
+                time.sleep(cooldown)
         durations.sort()
         request.config._benchresults[name] = (reportfunc, durations)
 
@@ -144,15 +170,25 @@ def pytest_terminal_summary(terminalreporter):
             tr.write_line(line)
 
 
-@pytest.fixture
-def imap(maildomain):
-    return ImapConn(maildomain)
+@pytest.fixture(scope="session")
+def ssl_context(chatmail_config):
+    if chatmail_config.tls_cert_mode == "self":
+        ctx = ssl.create_default_context()
+        ctx.check_hostname = False
+        ctx.verify_mode = ssl.CERT_NONE
+        return ctx
+    return None
 
 
 @pytest.fixture
-def make_imap_connection(maildomain):
+def imap(maildomain, ssl_context):
+    return ImapConn(maildomain, ssl_context=ssl_context)
+
+
+@pytest.fixture
+def make_imap_connection(maildomain, ssl_context):
     def make_imap_connection():
-        conn = ImapConn(maildomain)
+        conn = ImapConn(maildomain, ssl_context=ssl_context)
         conn.connect()
         return conn
 
@@ -164,12 +200,13 @@ class ImapConn:
     logcmd = "journalctl -f -u dovecot"
     name = "dovecot"
 
-    def __init__(self, host):
+    def __init__(self, host, ssl_context=None):
         self.host = host
+        self.ssl_context = ssl_context
 
     def connect(self):
         print(f"imap-connect {self.host}")
-        self.conn = imaplib.IMAP4_SSL(self.host)
+        self.conn = imaplib.IMAP4_SSL(self.host, ssl_context=self.ssl_context)
 
     def login(self, user, password):
         print(f"imap-login {user!r} {password!r}")
@@ -195,14 +232,14 @@ class ImapConn:
 
 
 @pytest.fixture
-def smtp(maildomain):
-    return SmtpConn(maildomain)
+def smtp(maildomain, ssl_context):
+    return SmtpConn(maildomain, ssl_context=ssl_context)
 
 
 @pytest.fixture
-def make_smtp_connection(maildomain):
+def make_smtp_connection(maildomain, ssl_context):
     def make_smtp_connection():
-        conn = SmtpConn(maildomain)
+        conn = SmtpConn(maildomain, ssl_context=ssl_context)
         conn.connect()
         return conn
 
@@ -214,12 +251,14 @@ class SmtpConn:
     logcmd = "journalctl -f -t postfix/smtpd -t postfix/smtp -t postfix/lmtp"
     name = "postfix"
 
-    def __init__(self, host):
+    def __init__(self, host, ssl_context=None):
         self.host = host
+        self.ssl_context = ssl_context
 
     def connect(self):
         print(f"smtp-connect {self.host}")
-        self.conn = smtplib.SMTP_SSL(self.host)
+        context = self.ssl_context or ssl.create_default_context()
+        self.conn = smtplib.SMTP_SSL(self.host, context=context)
 
     def login(self, user, password):
         print(f"smtp-login {user!r} {password!r}")
@@ -262,92 +301,142 @@ def gencreds(chatmail_config):
 
 
 #
-# Delta Chat testplugin re-use
+# Delta Chat RPC-based test support
 # use the cmfactory fixture to get chatmail instance accounts
 #
 
+from deltachat_rpc_client import DeltaChat, Rpc
 
-class ChatmailTestProcess:
-    """Provider for chatmail instance accounts as used by deltachat.testplugin.acfactory"""
 
-    def __init__(self, pytestconfig, maildomain, gencreds):
-        self.pytestconfig = pytestconfig
-        self.maildomain = maildomain
-        assert "." in self.maildomain, maildomain
+class ChatmailACFactory:
+    """RPC-based account factory for chatmail testing."""
+
+    def __init__(self, rpc, maildomain, gencreds, chatmail_config):
+        self.dc = DeltaChat(rpc)
+        self.rpc = rpc
+        self._maildomain = maildomain
         self.gencreds = gencreds
-        self._addr2files = {}
+        self.chatmail_config = chatmail_config
 
-    def get_liveconfig_producer(self):
-        while 1:
-            user, password = self.gencreds(self.maildomain)
-            config = {
-                "addr": user,
-                "mail_pw": password,
-            }
-            # speed up account configuration
-            config["mail_server"] = self.maildomain
-            config["send_server"] = self.maildomain
-            yield config
+    def _make_transport(self, domain):
+        """Build a transport config dict for the given domain."""
+        addr, password = self.gencreds(domain)
+        transport = {
+            "addr": addr,
+            "password": password,
+            # Setting server explicitly skips requesting autoconfig XML,
+            # see https://datatracker.ietf.org/doc/draft-ietf-mailmaint-autoconfig/
+            "imapServer": domain,
+            "smtpServer": domain,
+        }
+        if self.chatmail_config.tls_cert_mode == "self":
+            transport["certificateChecks"] = "acceptInvalidCertificates"
+        return transport
 
-    def cache_maybe_retrieve_configured_db_files(self, cache_addr, db_target_path):
-        pass
+    def get_online_account(self, domain=None):
+        """Create, configure and bring online a single account."""
+        return self.get_online_accounts(1, domain)[0]
 
-    def cache_maybe_store_configured_db_files(self, acc):
-        pass
+    def get_online_accounts(self, num, domain=None):
+        """Create multiple online accounts in parallel."""
+        domain = domain or self._maildomain
+        futures = []
+        accounts = []
+        for _ in range(num):
+            account = self.dc.add_account()
+            future = account.add_or_update_transport.future(
+                self._make_transport(domain)
+            )
+            futures.append(future)
+
+            # ensure messages stay in INBOX so that they can be
+            # concurrently fetched via extra IMAP connections during tests
+            account.set_config("delete_server_after", "10")
+            accounts.append(account)
+
+        for future in futures:
+            future()
+
+        for account in accounts:
+            account.bring_online()
+        return accounts
+
+    def get_accepted_chat(self, ac1, ac2):
+        """Create a 1:1 chat between ac1 and ac2 accepted on both sides."""
+        ac2.create_chat(ac1)
+        return ac1.create_chat(ac2)
+
+
+@pytest.fixture(scope="session")
+def rpc(tmp_path_factory):
+    """Start a deltachat-rpc-server process for the test session."""
+
+    # NB: accounts_dir must NOT already exist as directory --
+    # core-rust only creates accounts.toml if the dir doesn't exist yet.
+    accounts_dir = str(tmp_path_factory.mktemp("dc") / "accounts")
+    rpc = Rpc(accounts_dir=accounts_dir)
+    rpc.start()
+    yield rpc
+    rpc.close()
 
 
 @pytest.fixture
-def cmfactory(request, gencreds, tmpdir, maildomain):
-    # cloned from deltachat.testplugin.amfactory
-    pytest.importorskip("deltachat")
-    from deltachat.testplugin import ACFactory
-
-    testproc = ChatmailTestProcess(request.config, maildomain, gencreds)
-
-    class Data:
-        def read_path(self, path):
-            return
-
-    am = ACFactory(request=request, tmpdir=tmpdir, testprocess=testproc, data=Data())
-
-    # nb. a bit hacky
-    # would probably be better if deltachat's test machinery grows native support
-    def switch_maildomain(maildomain2):
-        am.testprocess.maildomain = maildomain2
-
-    am.switch_maildomain = switch_maildomain
-
-    yield am
-    if hasattr(request.node, "rep_call") and request.node.rep_call.failed:
-        if testproc.pytestconfig.getoption("--extra-info"):
-            logfile = io.StringIO()
-            am.dump_imap_summary(logfile=logfile)
-            print(logfile.getvalue())
-            # request.node.add_report_section("call", "imap-server-state", s)
+def cmfactory(rpc, gencreds, maildomain, chatmail_config):
+    """Return a ChatmailACFactory for creating online Delta Chat accounts."""
+    return ChatmailACFactory(
+        rpc=rpc,
+        maildomain=maildomain,
+        gencreds=gencreds,
+        chatmail_config=chatmail_config,
+    )
 
 
 @pytest.fixture
 def remote(sshdomain):
-    return Remote(sshdomain)
+    r = Remote(sshdomain)
+    yield r
+    r.close()
 
 
 class Remote:
     def __init__(self, sshdomain):
         self.sshdomain = sshdomain
+        self._procs = []
 
-    def iter_output(self, logcmd=""):
+    def iter_output(self, logcmd="", ready=None):
         getjournal = "journalctl -f" if not logcmd else logcmd
-        self.popen = subprocess.Popen(
-            ["ssh", f"root@{self.sshdomain}", getjournal],
+        print(self.sshdomain)
+        match self.sshdomain:
+            case "@local": command = []
+            case "localhost": command = []
+            case _: command = ["ssh", f"root@{self.sshdomain}"]
+        [command.append(arg) for arg in getjournal.split()]
+        popen = subprocess.Popen(
+            command,
+            stdin=subprocess.DEVNULL,
             stdout=subprocess.PIPE,
+            stderr=subprocess.DEVNULL,
         )
-        while 1:
-            line = self.popen.stdout.readline()
-            res = line.decode().strip().lower()
-            if res:
+        self._procs.append(popen)
+        try:
+            while 1:
+                line = popen.stdout.readline()
+                res = line.decode().strip().lower()
+                if not res:
+                    break
+                if ready is not None:
+                    ready()
+                    ready = None
                 yield res
-            else:
-                break
+        finally:
+            popen.terminate()
+            popen.wait()
+
+    def close(self):
+        while self._procs:
+            proc = self._procs.pop()
+            proc.kill()
+            proc.wait()
 
 
 @pytest.fixture
@@ -363,38 +452,45 @@ def lp(request):
 
 
 @pytest.fixture
-def cmsetup(maildomain, gencreds):
-    return CMSetup(maildomain, gencreds)
+def cmsetup(maildomain, gencreds, ssl_context):
+    return CMSetup(maildomain, gencreds, ssl_context)
+
+
+@pytest.fixture
+def cmsetup2(maildomain2, gencreds, ssl_context):
+    return CMSetup(maildomain2, gencreds, ssl_context)
 
 
 class CMSetup:
-    def __init__(self, maildomain, gencreds):
+    def __init__(self, maildomain, gencreds, ssl_context):
         self.maildomain = maildomain
         self.gencreds = gencreds
+        self.ssl_context = ssl_context
 
     def gen_users(self, num):
         print(f"Creating {num} online users")
         users = []
         for i in range(num):
-            addr, password = self.gencreds()
-            user = CMUser(self.maildomain, addr, password)
+            addr, password = self.gencreds(self.maildomain)
+            user = CMUser(self.maildomain, addr, password, self.ssl_context)
             assert user.smtp
             users.append(user)
         return users
 
 
 class CMUser:
-    def __init__(self, maildomain, addr, password):
+    def __init__(self, maildomain, addr, password, ssl_context=None):
         self.maildomain = maildomain
         self.addr = addr
         self.password = password
+        self.ssl_context = ssl_context
         self._smtp = None
         self._imap = None
 
     @property
     def smtp(self):
         if not self._smtp:
-            handle = SmtpConn(self.maildomain)
+            handle = SmtpConn(self.maildomain, ssl_context=self.ssl_context)
             handle.connect()
             handle.login(self.addr, self.password)
             self._smtp = handle
@@ -403,7 +499,7 @@ class CMUser:
     @property
     def imap(self):
         if not self._imap:
-            imap = ImapConn(self.maildomain)
+            imap = ImapConn(self.maildomain, ssl_context=self.ssl_context)
             imap.connect()
             imap.login(self.addr, self.password)
             self._imap = imap

cmdeploy/src/cmdeploy/tests/test_cmdeploy.py

@@ -23,15 +23,19 @@ class TestCmdline:
         run = parser.parse_args(["run"])
         assert init and run
 
-    def test_init_not_overwrite(self, capsys):
-        assert main(["init", "chat.example.org"]) == 0
+    def test_init_not_overwrite(self, capsys, tmp_path, monkeypatch):
+        monkeypatch.delenv("CHATMAIL_INI", raising=False)
+        inipath = tmp_path / "chatmail.ini"
+        args = ["init", "--config", str(inipath), "chat.example.org"]
+        assert main(args) == 0
         capsys.readouterr()
 
-        assert main(["init", "chat.example.org"]) == 1
+        assert main(args) == 1
         out, err = capsys.readouterr()
         assert "path exists" in out.lower()
 
-        assert main(["init", "chat.example.org", "--force"]) == 0
+        args.insert(1, "--force")
+        assert main(args) == 0
         out, err = capsys.readouterr()
         assert "deleting config file" in out.lower()
 

cmdeploy/src/cmdeploy/tests/test_dns.py

@@ -3,7 +3,7 @@ from copy import deepcopy
 import pytest
 
 from cmdeploy import remote
-from cmdeploy.dns import check_full_zone, check_initial_remote_data
+from cmdeploy.dns import check_full_zone, check_initial_remote_data, parse_zone_records
 
 
 @pytest.fixture
@@ -60,6 +60,29 @@ def mockdns(request, mockdns_base, mockdns_expected):
     return mockdns_base
 
 
+class TestGetDkimEntry:
+    def test_dkim_entry_returns_tuple_on_success(self, mockdns):
+        entry, web_entry = remote.rdns.get_dkim_entry(
+            "some.domain", "", dkim_selector="opendkim"
+        )
+        # May return None,None if openssl not available, but should never crash
+        if entry is not None:
+            assert "opendkim._domainkey.some.domain" in entry
+            assert "opendkim._domainkey.some.domain" in web_entry
+
+    def test_dkim_entry_returns_none_tuple_on_error(self, monkeypatch):
+        """CalledProcessError must return (None, None), not bare None."""
+        from subprocess import CalledProcessError
+
+        def failing_shell(command, fail_ok=False, print=print):
+            raise CalledProcessError(1, command)
+
+        monkeypatch.setattr(remote.rdns, "shell", failing_shell)
+        result = remote.rdns.get_dkim_entry("some.domain", "", dkim_selector="opendkim")
+        assert result == (None, None)
+        assert result[0] is None and result[1] is None
+
+
 class TestPerformInitialChecks:
     def test_perform_initial_checks_ok1(self, mockdns, mockdns_expected):
         remote_data = remote.rdns.perform_initial_checks("some.domain")
@@ -91,19 +114,60 @@ class TestPerformInitialChecks:
         assert not res
         assert len(l) == 2
 
+    def test_perform_initial_checks_no_mta_sts_self_signed(self, mockdns):
+        del mockdns["CNAME"]["mta-sts.some.domain"]
+        remote_data = remote.rdns.perform_initial_checks("some.domain")
+        assert not remote_data["MTA_STS"]
+
+        l = []
+        res = check_initial_remote_data(remote_data, strict_tls=False, print=l.append)
+        assert res
+        assert not l
+
+
+def test_parse_zone_records():
+    text = """
+    ; This is a comment
+    some.domain. 3600 IN A 1.1.1.1
+
+    ; Another comment
+    www.some.domain. 3600 IN CNAME some.domain.
+
+    ; Multi-word rdata
+    some.domain. 3600 IN MX 10 mail.some.domain.
+
+    ; DKIM record (single line, multi-word TXT rdata)
+    dkim._domainkey.some.domain. 3600 IN TXT "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG" "9w0BAQEFAAOCAQ8AMIIBCgKCAQEA"
+
+    ; Another TXT record
+    _dmarc.some.domain. 3600 IN TXT "v=DMARC1;p=reject"
+    """
+    records = list(parse_zone_records(text))
+    assert records == [
+        ("some.domain", "3600", "A", "1.1.1.1"),
+        ("www.some.domain", "3600", "CNAME", "some.domain."),
+        ("some.domain", "3600", "MX", "10 mail.some.domain."),
+        (
+            "dkim._domainkey.some.domain",
+            "3600",
+            "TXT",
+            '"v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG" "9w0BAQEFAAOCAQ8AMIIBCgKCAQEA"',
+        ),
+        ("_dmarc.some.domain", "3600", "TXT", '"v=DMARC1;p=reject"'),
+    ]
+
+
+def test_parse_zone_records_invalid_line():
+    text = "invalid line"
+    with pytest.raises(ValueError, match="Bad zone record line"):
+        list(parse_zone_records(text))
+
 
 def parse_zonefile_into_dict(zonefile, mockdns_base, only_required=False):
-    for zf_line in zonefile.split("\n"):
-        if zf_line.startswith("#"):
-            if "Recommended" in zf_line and only_required:
-                return
-            continue
-        if not zf_line.strip():
-            continue
-        zf_domain, zf_typ, zf_value = zf_line.split(maxsplit=2)
-        zf_domain = zf_domain.rstrip(".")
-        zf_value = zf_value.strip()
-        mockdns_base.setdefault(zf_typ, {})[zf_domain] = zf_value
+    if only_required:
+        zonefile = zonefile.split("; Recommended")[0]
+    for name, ttl, rtype, rdata in parse_zone_records(zonefile):
+        mockdns_base.setdefault(rtype, {})[name] = rdata
 
 
 class MockSSHExec:

cmdeploy/src/cmdeploy/tests/test_external_tls.py

@@ -0,0 +1,78 @@
+"""Functional tests for tls_external_cert_and_key option."""
+
+import json
+
+import chatmaild.newemail
+import pytest
+from chatmaild.config import read_config, write_initial_config
+
+
+def make_external_config(tmp_path, cert_key=None):
+    inipath = tmp_path / "chatmail.ini"
+    overrides = {}
+    if cert_key is not None:
+        overrides["tls_external_cert_and_key"] = cert_key
+    write_initial_config(inipath, "chat.example.org", overrides=overrides)
+    return inipath
+
+
+def test_external_tls_config_reads_paths(tmp_path):
+    inipath = make_external_config(
+        tmp_path,
+        cert_key=(
+            "/etc/letsencrypt/live/chat.example.org/fullchain.pem"
+            " /etc/letsencrypt/live/chat.example.org/privkey.pem"
+        ),
+    )
+    config = read_config(inipath)
+    assert config.tls_cert_mode == "external"
+    assert (
+        config.tls_cert_path == "/etc/letsencrypt/live/chat.example.org/fullchain.pem"
+    )
+    assert config.tls_key_path == "/etc/letsencrypt/live/chat.example.org/privkey.pem"
+
+
+def test_external_tls_missing_option_uses_acme(tmp_path):
+    config = read_config(make_external_config(tmp_path))
+    assert config.tls_cert_mode == "acme"
+
+
+def test_external_tls_bad_format_raises(tmp_path):
+    inipath = make_external_config(tmp_path, cert_key="/only/one/path.pem")
+    with pytest.raises(ValueError, match="two space-separated"):
+        read_config(inipath)
+
+
+def test_external_tls_three_paths_raises(tmp_path):
+    inipath = make_external_config(tmp_path, cert_key="/a /b /c")
+    with pytest.raises(ValueError, match="two space-separated"):
+        read_config(inipath)
+
+
+def test_external_tls_no_dclogin_url(tmp_path, capsys, monkeypatch):
+    inipath = make_external_config(
+        tmp_path, cert_key="/certs/fullchain.pem /certs/privkey.pem"
+    )
+    monkeypatch.setattr(chatmaild.newemail, "CONFIG_PATH", str(inipath))
+    chatmaild.newemail.print_new_account()
+    out, _ = capsys.readouterr()
+    lines = out.split("\n")
+    dic = json.loads(lines[2])
+    assert "dclogin_url" not in dic
+
+
+def test_external_tls_selects_correct_deployer(tmp_path):
+    from cmdeploy.deployers import get_tls_deployer
+    from cmdeploy.external.deployer import ExternalTlsDeployer
+    from cmdeploy.selfsigned.deployer import SelfSignedTlsDeployer
+
+    inipath = make_external_config(
+        tmp_path, cert_key="/certs/fullchain.pem /certs/privkey.pem"
+    )
+    config = read_config(inipath)
+    deployer = get_tls_deployer(config, "chat.example.org")
+
+    assert isinstance(deployer, ExternalTlsDeployer)
+    assert not isinstance(deployer, SelfSignedTlsDeployer)
+    assert deployer.cert_path == "/certs/fullchain.pem"
+    assert deployer.key_path == "/certs/privkey.pem"

cmdeploy/src/cmdeploy/tests/test_rshell.py

@@ -0,0 +1,68 @@
+from unittest.mock import patch
+
+from cmdeploy.remote.rshell import dovecot_recalc_quota
+
+
+def test_dovecot_recalc_quota_normal_output():
+    """Normal doveadm output returns parsed dict."""
+    normal_output = (
+        "Quota name Type    Value  Limit  %\n"
+        "User quota STORAGE     5 102400  0\n"
+        "User quota MESSAGE     2      -  0\n"
+    )
+
+    with patch("cmdeploy.remote.rshell.shell", return_value=normal_output):
+        result = dovecot_recalc_quota("user@example.org")
+
+    # shell is called twice (recalc + get), patch returns same for both
+    assert result == {"value": 5, "limit": 102400, "percent": 0}
+
+
+def test_dovecot_recalc_quota_empty_output():
+    """Empty doveadm output (trailing newline) must not IndexError."""
+    call_count = [0]
+
+    def mock_shell(cmd):
+        call_count[0] += 1
+        if "recalc" in cmd:
+            return ""
+        # quota get returns only empty lines
+        return "\n\n"
+
+    with patch("cmdeploy.remote.rshell.shell", side_effect=mock_shell):
+        result = dovecot_recalc_quota("user@example.org")
+
+    assert result is None
+
+
+def test_dovecot_recalc_quota_malformed_output():
+    """Malformed output with too few columns must not crash."""
+    call_count = [0]
+
+    def mock_shell(cmd):
+        call_count[0] += 1
+        if "recalc" in cmd:
+            return ""
+        # partial line, fewer than 6 parts
+        return "Quota name\nUser quota STORAGE\n"
+
+    with patch("cmdeploy.remote.rshell.shell", side_effect=mock_shell):
+        result = dovecot_recalc_quota("user@example.org")
+
+    assert result is None
+
+
+def test_dovecot_recalc_quota_header_only():
+    """Only header line, no data rows."""
+    call_count = [0]
+
+    def mock_shell(cmd):
+        call_count[0] += 1
+        if "recalc" in cmd:
+            return ""
+        return "Quota name Type    Value  Limit  %\n"
+
+    with patch("cmdeploy.remote.rshell.shell", side_effect=mock_shell):
+        result = dovecot_recalc_quota("user@example.org")
+
+    assert result is None

cmdeploy/src/cmdeploy/unbound/unbound.conf.j2

@@ -0,0 +1,4 @@
+# Managed by cmdeploy: disable IPv6 in unbound.
+server:
+  interface: 127.0.0.1
+  do-ip6: no

cmdeploy/uv.lock

@@ -1,886 +0,0 @@
-version = 1
-revision = 1
-requires-python = ">=3.12"
-
-[[package]]
-name = "bcrypt"
-version = "5.0.0"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/d4/36/3329e2518d70ad8e2e5817d5a4cac6bba05a47767ec416c7d020a965f408/bcrypt-5.0.0.tar.gz", hash = "sha256:f748f7c2d6fd375cc93d3fba7ef4a9e3a092421b8dbf34d8d4dc06be9492dfdd", size = 25386 }
-wheels = [
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doc/README.md

@@ -6,7 +6,7 @@ You can use the `make` command and `make html` to build web pages.
 
 You need a Python environment where the following install was excuted: 
 
-    uv pip install furo sphinx-autobuild
+    pip install furo sphinx-autobuild
 
 To develop/change documentation, you can then do: 
 

doc/source/getting_started.rst

@@ -16,15 +16,16 @@ You will need the following:
 
 -  Control over a domain through a DNS provider of your choice.
 
--  A Debian 12 server with reachable SMTP/SUBMISSIONS/IMAPS/HTTPS ports.
+-  A Debian 12 **deployment server** with reachable SMTP/SUBMISSIONS/IMAPS/HTTPS ports.
    IPv6 is encouraged if available. Chatmail relay servers only require
    1GB RAM, one CPU, and perhaps 10GB storage for a few thousand active
    chatmail addresses.
 
--  Key-based SSH authentication to the root user. You must add a
-   passphrase-protected private key to your local ssh-agent because you
-   can’t type in your passphrase during deployment. (An ed25519 private
-   key is required due to an `upstream bug in
+-  A Linux or Unix **build machine** with key-based SSH access to the root
+   user of the deployment server.
+   You must add a passphrase-protected private key to your local ssh-agent because you
+   can’t type in your passphrase during deployment.
+   (An ed25519 private key is required due to an `upstream bug in
    paramiko <https://github.com/paramiko/paramiko/issues/2191>`_)
 
 
@@ -34,7 +35,8 @@ Setup with ``scripts/cmdeploy``
 We use ``chat.example.org`` as the chatmail domain in the following
 steps. Please substitute it with your own domain.
 
-1. Setup the initial DNS records. The following is an example in the
+1. Setup the initial DNS records for your deployment server.
+   The following is an example in the
    familiar BIND zone file format with a TTL of 1 hour (3600 seconds).
    Please substitute your domain and IP addresses.
 
@@ -45,8 +47,16 @@ steps. Please substitute it with your own domain.
        www.chat.example.org. 3600 IN CNAME chat.example.org.
        mta-sts.chat.example.org. 3600 IN CNAME chat.example.org.
 
+   .. note::
+
+      For experimental deployments using self-signed certificates,
+      use a domain name starting with ``_``
+      (e.g. ``_chat.example.org``).
+      The ``mta-sts`` CNAME and ``_mta-sts`` TXT records
+      are not needed for such domains.
+
 2. On your local PC, clone the repository and bootstrap the Python
-    environment using ``uv``.
+   virtualenv.
 
    ::
 
@@ -54,20 +64,30 @@ steps. Please substitute it with your own domain.
        cd relay
        scripts/initenv.sh
 
-3. On your local PC, create chatmail configuration file
+3. On your local build machine (PC), create a chatmail configuration file
    ``chatmail.ini``:
 
    ::
 
        scripts/cmdeploy init chat.example.org  # <-- use your domain
 
-4. Verify that SSH root login to your remote server works:
+   To use self-signed TLS certificates
+   instead of Let's Encrypt,
+   use a domain name starting with ``_``
+   (e.g. ``scripts/cmdeploy init _chat.example.org``).
+   Domains starting with ``_`` cannot obtain WebPKI certificates,
+   so self-signed mode is derived automatically.
+   This is useful for private or test deployments.
+   See the :doc:`overview`
+   for details on certificate provisioning.
+
+4. Verify that SSH root login to the deployment server server works:
 
    ::
 
        ssh root@chat.example.org  # <-- use your domain
 
-5. From your local PC, deploy the remote chatmail relay server:
+5. From your local build machine, setup and configure the remote deployment server:
 
    ::
 
@@ -81,7 +101,7 @@ steps. Please substitute it with your own domain.
 Other helpful commands
 ----------------------
 
-To check the status of your remotely running chatmail service:
+To check the status of your deployment server running the chatmail service:
 
 ::
 
@@ -158,7 +178,7 @@ Disable automatic address creation
 --------------------------------------------------------
 
 If you need to stop address creation, e.g. because some script is wildly
-creating addresses, login with ssh and run:
+creating addresses, login with ssh to the deployment machine and run:
 
 ::
 
@@ -167,3 +187,72 @@ creating addresses, login with ssh and run:
 Chatmail address creation will be denied while this file is present.
 
 
+Running a relay with self-signed certificates
+----------------------------------------------
+
+Use a domain name starting with ``_`` (e.g. ``_chat.example.org``)
+to run a relay with self-signed certificates.
+Domains starting with ``_`` cannot obtain WebPKI certificates
+so the relay automatically uses self-signed certificates
+and all other relays will accept connections from it
+without requiring certificate verification.
+This is useful for experimental setups and testing.
+
+.. _external-tls:
+
+Running a relay with externally managed certificates
+-----------------------------------------------------
+
+If you already have a TLS certificate manager
+(e.g. Traefik, certbot, or another ACME client)
+running on the deployment server,
+you can configure the relay to use those certificates
+instead of the built-in ``acmetool``.
+
+Set the following in ``chatmail.ini``::
+
+    tls_external_cert_and_key = /path/to/fullchain.pem /path/to/privkey.pem
+
+The paths must point to certificate and key files
+on the deployment server.
+During ``cmdeploy run``, these paths are written into
+the Postfix, Dovecot, and Nginx configurations.
+No certificate files are transferred from the build machine —
+they must already exist on the server,
+managed by your external certificate tool.
+
+The deploy will verify that both files exist on the server.
+``acmetool`` is **not** installed or run in this mode.
+
+.. note::
+
+   You are responsible for certificate renewal.
+   When the certificate file changes on disk,
+   all relay services pick up the new certificate automatically
+   via a systemd path watcher installed during deploy.
+   The watcher uses inotify, which does not cross bind-mount boundaries.
+   If you use such a setup, you must trigger the reload explicitly after renewal::
+
+      systemctl start tls-cert-reload.service
+
+
+Migrating to a new build machine
+----------------------------------
+
+To move or add a build machine,
+clone the relay repository on the new build machine, and copy the ``chatmail.ini`` file from the old build machine.
+Make sure ``rsync`` is installed, then initialize the environment:
+
+::
+
+   ./scripts/initenv.sh
+
+Run safety checks before a new deployment:
+
+::
+
+   ./scripts/cmdeploy dns
+   ./scripts/cmdeploy status
+
+If you keep multiple build machines (ie laptop and desktop), keep ``chatmail.ini`` in sync between
+them.

doc/source/overview.rst

@@ -15,11 +15,11 @@ has four main directories.
 `scripts <https://github.com/chatmail/relay/tree/main/scripts>`_
 offers two convenience tools for beginners:
 
-- ``initenv.sh`` installs a local Python environment using ``uv`` and
-  installs necessary dependencies.
+- ``initenv.sh`` installs a local virtualenv Python environment and
+  installs necessary dependencies
 
 - ``scripts/cmdeploy`` script enables you to run the ``cmdeploy``
-  command line tool using ``uv run``.
+  command line tool in the local Python virtual environment.
 
 
 ``cmdeploy/``
@@ -42,6 +42,11 @@ The deployed system components of a chatmail relay are:
 -  Dovecot_ is the Mail Delivery Agent (MDA) and
    stores messages for users until they download them
 
+-  `filtermail <https://github.com/chatmail/filtermail>`_
+   prevents unencrypted email from leaving or entering the chatmail
+   service and is integrated into Postfix’s outbound and inbound mail
+   pipelines.
+
 -  Nginx_ shows the web page with privacy policy and additional information
 
 -  `acmetool <https://hlandau.github.io/acmetool/>`_ manages TLS
@@ -85,11 +90,6 @@ short overview of ``chatmaild`` services:
    <https://doc.dovecot.org/2.3/configuration_manual/authentication/dict/#complete-example-for-authenticating-via-a-unix-socket>`_
    to authenticate logins.
 
--  `filtermail <https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/filtermail.py>`_
-   prevents unencrypted email from leaving or entering the chatmail
-   service and is integrated into Postfix’s outbound and inbound mail
-   pipelines.
-
 -  `chatmail-metadata <https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/metadata.py>`_
    is contacted by a `Dovecot lua
    script <https://github.com/chatmail/relay/blob/main/cmdeploy/src/cmdeploy/dovecot/push_notification.lua>`_
@@ -109,10 +109,6 @@ short overview of ``chatmaild`` services:
    is contacted by Dovecot when a user logs in and stores the date of
    the login.
 
--  `metrics <https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/metrics.py>`_
-   collects some metrics and displays them at
-   ``https://example.org/metrics``.
-
 ``www/``
 ~~~~~~~~~
 
@@ -142,11 +138,9 @@ Chatmail relay dependency diagram
         nginx-internal --- autoconfig.xml;
         certs-nginx[("`TLS certs
         /var/lib/acme`")] --> nginx-internal;
-        systemd-timer --- chatmail-metrics;
         systemd-timer --- acmetool;
         systemd-timer --- chatmail-expire-daily;
         systemd-timer --- chatmail-fsreport-daily;
-        chatmail-metrics --- website;
         acmetool --> certs[("`TLS certs
         /var/lib/acme`")];
         nginx-external --- |993|dovecot;
@@ -297,8 +291,7 @@ TLS requirements
 
 Postfix is configured to require valid TLS by setting
 `smtp_tls_security_level <https://www.postfix.org/postconf.5.html#smtp_tls_security_level>`_
-to ``verify``. If emails don’t arrive at your chatmail relay server, the
-problem is likely that your relay does not have a valid TLS certificate.
+to ``verify``.
 
 You can test it by resolving ``MX`` records of your relay domain and
 then connecting to MX relays (e.g ``mx.example.org``) with
@@ -309,6 +302,11 @@ When providing a TLS certificate to your chatmail relay server, make
 sure to provide the full certificate chain and not just the last
 certificate.
 
+If you use an external certificate manager (e.g. Traefik or certbot),
+set ``tls_external_cert_and_key`` in ``chatmail.ini``
+to provide the certificate and key paths.
+See :ref:`external-tls` for details.
+
 If you are running an Exim server and don’t see incoming connections
 from a chatmail relay server in the logs, make sure ``smtp_no_mail`` log
 item is enabled in the config with ``log_selector = +smtp_no_mail``. By
@@ -317,6 +315,14 @@ default Exim does not log sessions that are closed before sending the
 by Postfix, so you might think that connection is not established while
 actually it is a problem with your TLS certificate.
 
+If emails don’t arrive at your chatmail relay server, the
+problem is likely that your relay does not have a valid TLS certificate.
+
+Note that connections to relays with underscore-prefixed test domains
+(e.g. ``_chat.example.org``) use ``encrypt`` tls security level,
+because such domains cannot obtain valid Let's Encrypt certificates
+and run with self-signed certificates.
+
 
 .. _dovecot: https://dovecot.org
 .. _postfix: https://www.postfix.org

doc/source/related.rst

@@ -14,10 +14,10 @@ We know of three work-in-progress alternative implementation efforts:
    it to support all of the features and configuration settings required
    to operate as a chatmail relay.
 
--  `Maddy-Chatmail <https://github.com/sadraiiali/maddy_chatmail>`_: a
-   plugin for the `Maddy email server <https://maddy.email/>`_ which
-   aims to implement the chatmail relay features and configuration
-   options.
+-  `Madmail <https://github.com/themadorg/madmail>`_: an
+   experimental fork of `Maddy Mail Server <https://maddy.email/>`_, modified
+   for chatmail deployments.  It provides a single binary solution
+   for running a chatmail relay.
 
 -  `Chatmail Cookbook <https://github.com/feld/chatmail-cookbook>`_:
    A Chef Cookbook implementing a relay server. The project follows the

doc/tool/lxc_test_en.md

@@ -1,42 +0,0 @@
-# Testing with LXC
-
-To test the relay setup in a local LXC container (tested on Arch Linux host):
-
-### 1. Host Preparation
-Install the necessary packages:
-```bash
-sudo pacman -S lxc arch-install-scripts dnsmasq
-```
-
-### 2. Network Configuration
-If your host system has IPv6 disabled, you must disable it for LXC as well to avoid service failures:
-Edit `/etc/default/lxc-net` and ensure these lines exist:
-```bash
-USE_LXC_BRIDGE="true"
-LXC_IPV6_ENABLE="false"
-LXC_IPV6_NAT="false"
-```
-*Note: If port 53 is occupied (e.g., by dnscrypt-proxy), you may need to configure your DNS service to listen only on `127.0.0.1` so LXC's dnsmasq can bind to the bridge.*
-
-Restart the network:
-```bash
-sudo systemctl enable --now lxc-net.service
-```
-
-### 3. Create and Prepare Container
-Create a Debian 12 (bookworm) container:
-```bash
-sudo lxc-create -n test -t download -- -d debian -r bookworm -a amd64
-sudo lxc-start -n test
-```
-
-Sync your local repository to the container:
-```bash
-sudo rsync -av --exclude=.git ./ /var/lib/lxc/test/rootfs/relay-ir/
-```
-
-### 4. Run Deployment
-Attach to the container and run the deployment locally:
-```bash
-sudo lxc-attach -n test -- bash -c "cd /relay-ir && ./scripts/initenv.sh && ./scripts/cmdeploy run --ssh-host @local --skip-dns-check"
-```

doc/tool/lxc_test_fa.md

@@ -1,42 +0,0 @@
-# تست با LXC
-
-برای تست تنظیمات رله در یک کانتینر محلی LXC (تست شده روی میزبان آرچ لینوکس):
-
-### ۱. آماده‌سازی میزبان
-بسته‌های مورد نیاز را نصب کنید:
-```bash
-sudo pacman -S lxc arch-install-scripts dnsmasq
-```
-
-### ۲. پیکربندی شبکه
-اگر IPv6 در سیستم میزبان شما غیرفعال است، باید آن را برای LXC نیز غیرفعال کنید تا از بروز خطا جلوگیری شود:
-فایل `/etc/default/lxc-net` را ویرایش کرده و مطمین شوید این خطوط وجود دارند:
-```bash
-USE_LXC_BRIDGE="true"
-LXC_IPV6_ENABLE="false"
-LXC_IPV6_NAT="false"
-```
-*نکته: اگر پورت ۵۳ اشغال است (مثلاً توسط dnscrypt-proxy)، ممکن است لازم باشد سرویس DNS خود را طوری تنظیم کنید که فقط روی `127.0.0.1` گوش دهد تا dnsmasq مربوط به LXC بتواند به بریج متصل شود.*
-
-شبکه را راه‌اندازی کنید:
-```bash
-sudo systemctl enable --now lxc-net.service
-```
-
-### ۳. ساخت و آماده‌سازی کانتینر
-یک کانتینر دبیان ۱۲ (bookworm) بسازید:
-```bash
-sudo lxc-create -n test -t download -- -d debian -r bookworm -a amd64
-sudo lxc-start -n test
-```
-
-کد محلی خود را به کانتینر منتقل کنید:
-```bash
-sudo rsync -av --exclude=.git ./ /var/lib/lxc/test/rootfs/relay-ir/
-```
-
-### ۴. اجرای استقرار (Deployment)
-به کانتینر متصل شده و استقرار را به صورت محلی اجرا کنید:
-```bash
-sudo lxc-attach -n test -- bash -c "cd /relay-ir && ./scripts/initenv.sh && ./scripts/cmdeploy run --ssh-host @local --skip-dns-check"
-```

init.sh

@@ -1,125 +0,0 @@
-#!/bin/bash
-set -e
-
-# 0. Ask for domain and email at the beginning
-get_config_value() {
-    local key=$1
-    local file=$2
-    if [ -f "$file" ]; then
-        grep "^$key =" "$file" | head -n 1 | cut -d'=' -f2 | sed 's/^[[:space:]]*//;s/[[:space:]]*$//'
-    fi
-}
-
-INI_FILE="chatmail.ini"
-if [ -d "relay-ir" ]; then
-    INI_FILE="relay-ir/chatmail.ini"
-fi
-
-if [ -z "$MAIL_DOMAIN" ]; then
-    MAIL_DOMAIN=$(get_config_value "mail_domain" "$INI_FILE")
-fi
-
-if [ -z "$ACME_EMAIL" ]; then
-    ACME_EMAIL=$(get_config_value "acme_email" "$INI_FILE")
-fi
-
-if [ -z "$MAIL_DOMAIN" ]; then
-    read -p "Enter your mail domain (e.g. example.com): " MAIL_DOMAIN < /dev/tty
-fi
-
-if [ -z "$ACME_EMAIL" ]; then
-    read -p "Enter your email for ACME/Let's Encrypt: " ACME_EMAIL < /dev/tty
-fi
-
-# 1. Update and install dependencies
-echo "--- Installing dependencies ---"
-# Ubuntu 24.04 and others might need universe for python3-dev
-if command -v add-apt-repository > /dev/null 2>&1; then
-    sudo add-apt-repository -y universe
-fi
-
-# We use a timeout for the lock to handle automatic updates running in the background
-sudo apt-get update -o DPkg::Lock::Timeout=120
-sudo apt-get install -y -o DPkg::Lock::Timeout=120 git curl wget python3-dev build-essential python3 nano sed
-
-# 1.1 Install uv
-export PATH="$HOME/.local/bin:/root/.local/bin:$PATH"
-if ! command -v uv > /dev/null 2>&1; then
-    if [ -f "/root/.local/bin/uv" ]; then
-        export PATH="/root/.local/bin:$PATH"
-    elif [ -f "$HOME/.local/bin/uv" ]; then
-        export PATH="$HOME/.local/bin:$PATH"
-    fi
-fi
-
-if ! command -v uv > /dev/null 2>&1; then
-    echo "--- Installing uv ---"
-    curl -LsSf https://astral.sh/uv/install.sh | sh
-    # Ensure uv is in PATH for the current script
-    export PATH="$HOME/.local/bin:/root/.local/bin:$PATH"
-fi
-
-# 2. Clone the repository if not already in it
-if [ ! -d "relay-ir" ]; then
-    # Check if we are already inside a relay-ir directory
-    if [ -f "scripts/cmdeploy" ]; then
-        echo "--- Already inside relay-ir directory ---"
-        git pull
-    else
-        echo "--- Cloning relay-ir ---"
-        git clone https://github.com/omidz4t/relay-ir.git
-        cd relay-ir
-    fi
-else
-    echo "--- relay-ir directory already exists, updating ---"
-    cd relay-ir
-    git pull
-fi
-
-# 3. Initialize environment
-echo "--- Initializing environment ---"
-./scripts/initenv.sh
-
-# 4. Ask for domain and email (already handled at the beginning)
-
-
-# 5. Initialize configuration
-echo "--- Initializing chatmail configuration ---"
-./scripts/cmdeploy init "$MAIL_DOMAIN" || true
-
-
-# 6. Modify chatmail.ini with specific requirements
-echo "--- Customizing chatmail.ini ---"
-# Using sed to update the values. We use -i to edit in-place.
-# Note: some lines might be commented or have different defaults, 
-# so we'll try to replace existing keys or add them if they don't exist.
-
-update_config() {
-    local key=$1
-    local value=$2
-    if grep -q "^$key =" chatmail.ini; then
-        sed -i "s/^$key =.*/$key = $value/" chatmail.ini
-    else
-        # If it's commented out or missing, we append it after [params] or at the end
-        sed -i "/\[params\]/a $key = $value" chatmail.ini
-    fi
-}
-
-update_config "max_mailbox_size" "500M"
-update_config "max_message_size" "31457280"
-update_config "delete_mails_after" "20"
-update_config "username_min_length" "9"
-update_config "username_max_length" "9"
-update_config "password_min_length" "9"
-update_config "acme_email" "$ACME_EMAIL"
-
-echo "--- Current chatmail.ini configuration ---"
-cat chatmail.ini
-
-# 7. Run deployment
-echo "--- Starting deployment ---"
-# Adding /usr/sbin and /sbin to PATH as requested to ensure sysctl and other tools are found
-export PATH=$PATH:/usr/sbin:/sbin
-sudo -E PATH="$PATH" scripts/cmdeploy run --ssh-host @local --skip-dns-check
-
-echo "--- Deployment finished ---"

pyproject.toml

@@ -1,29 +0,0 @@
-[project]
-name = "relay-ir"
-version = "0.1.0"
-description = "Chatmail relay workspace"
-readme = "README.md"
-requires-python = ">=3.11"
-dependencies = [
-    "chatmaild",
-    "cmdeploy",
-    "sphinx",
-    "sphinxcontrib-mermaid",
-    "sphinx-autobuild",
-    "furo",
-]
-
-[tool.uv]
-managed = true
-package = false
-
-[tool.uv.workspace]
-members = ["chatmaild", "cmdeploy"]
-
-[tool.uv.sources]
-chatmaild = { workspace = true }
-cmdeploy = { workspace = true }
-
-[build-system]
-requires = ["setuptools>=61"]
-build-backend = "setuptools.build_meta"

scripts/build-docs.sh

@@ -2,8 +2,6 @@
 #
 # Wrapper for building the docs
 set -e
-# Ensure uv is in PATH
-export PATH="$HOME/.local/bin:/root/.local/bin:$PATH"
-
+. venv/bin/activate
 cd doc/
-uv run make html
+make html

scripts/cmdeploy

@@ -2,7 +2,5 @@
 #
 # Wrapper for cmdelpoy to run it in activated virtualenv.
 set -e
-# Ensure uv is in PATH
-export PATH="$HOME/.local/bin:/root/.local/bin:$PATH"
-
-uv run cmdeploy "$@"
+. venv/bin/activate
+cmdeploy "$@"

scripts/initenv.sh

@@ -18,20 +18,8 @@ if command -v lsb_release 2>&1 >/dev/null; then
   esac
 fi
 
-# Ensure uv is in PATH
-export PATH="$HOME/.local/bin:/root/.local/bin:$PATH"
+python3 -m venv --upgrade-deps venv
 
-if ! command -v uv > /dev/null 2>&1; then
-    if [ -f "/root/.local/bin/uv" ]; then
-        export PATH="/root/.local/bin:$PATH"
-    elif [ -f "$HOME/.local/bin/uv" ]; then
-        export PATH="$HOME/.local/bin:$PATH"
-    fi
-fi
-
-if ! command -v uv > /dev/null 2>&1; then
-    echo "uv not found. Please install it first or run init.sh"
-    exit 1
-fi
-
-uv sync --python 3.11
+venv/bin/pip install -e chatmaild 
+venv/bin/pip install -e cmdeploy
+venv/bin/pip install sphinx sphinxcontrib-mermaid sphinx-autobuild furo  # for building the docs

test/lxc_runner.py

@@ -1,97 +0,0 @@
-import subprocess
-import sys
-import time
-import os
-import shutil
-
-# This script automates LXC container creation and relay deployment testing.
-# It cleans up old containers, creates a new one, and runs the deployment.
-
-CONTAINER_PREFIX = "testrelay"
-CONTAINER_NAME = f"{CONTAINER_PREFIX}-auto"
-RELAY_SRC = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
-
-def run_cmd(cmd, check=True, shell=True):
-    print(f"Executing: {cmd}")
-    try:
-        result = subprocess.run(cmd, shell=shell, check=check, capture_output=True, text=True)
-        return result.stdout.strip()
-    except subprocess.CalledProcessError as e:
-        print(f"Error executing command: {e}")
-        print(f"Stdout: {e.stdout}")
-        print(f"Stderr: {e.stderr}")
-        if check:
-            sys.exit(1)
-        return None
-
-def cleanup():
-    print("--- Cleaning up old containers ---")
-    containers = run_cmd("sudo lxc-ls -1").splitlines()
-    for c in containers:
-        if c.startswith(CONTAINER_PREFIX):
-            print(f"Destroying container: {c}")
-            run_cmd(f"sudo lxc-destroy -n {c} -f", check=False)
-
-def create_container():
-    print(f"--- Creating container: {CONTAINER_NAME} ---")
-    run_cmd(f"sudo lxc-create -n {CONTAINER_NAME} -t download -- -d debian -r bookworm -a amd64")
-
-def run_in_container(name, command):
-    return run_cmd(f'sudo lxc-attach -n {name} -- bash -c "{command}"')
-
-def prepare_container():
-    print("--- Preparing container ---")
-    run_cmd(f"sudo lxc-start -n {CONTAINER_NAME}")
-    
-    # Wait for IP
-    print("Waiting for container IP...")
-    for _ in range(30):
-        ip = run_cmd(f"sudo lxc-info -n {CONTAINER_NAME} -i").split()
-        if ip and len(ip) > 1:
-            print(f"Container IP: {ip[1]}")
-            break
-        time.sleep(1)
-    else:
-        print("Failed to get container IP.")
-        sys.exit(1)
-
-    # Disable systemd-resolved to free port 53
-    run_in_container(CONTAINER_NAME, "systemctl disable --now systemd-resolved || true")
-    run_in_container(CONTAINER_NAME, "echo 'nameserver 8.8.8.8' > /etc/resolv.conf")
-    
-    # Sync code
-    print("Syncing code to container...")
-    target_path = f"/var/lib/lxc/{CONTAINER_NAME}/rootfs/relay-ir"
-    run_cmd(f"sudo mkdir -p {target_path}")
-    run_cmd(f"sudo rsync -av --exclude=.git --exclude='*.log' --exclude='test' {RELAY_SRC}/ {target_path}/")
-
-    # Install dependencies
-    print("Installing dependencies inside container...")
-    run_in_container(CONTAINER_NAME, "apt-get update && apt-get install -y curl sudo python3-dev gcc")
-    run_in_container(CONTAINER_NAME, "apt-get remove --purge -y exim4*")
-    run_in_container(CONTAINER_NAME, "curl -LsSf https://astral.sh/uv/install.sh | sh")
-
-def perform_deployment():
-    print("--- Running deployment test ---")
-    # Using the PATH where uv is installed
-    path_env = "export PATH='/root/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'"
-    deploy_cmd = f"cd /relay-ir && {path_env} && ./scripts/initenv.sh && ./scripts/cmdeploy run --ssh-host @local --skip-dns-check"
-    
-    try:
-        output = run_in_container(CONTAINER_NAME, deploy_cmd)
-        print("Deployment Output Summary:")
-        print(output[-1000:] if output else "No output") # Show last bit of output
-        print("\nSUCCESS: Deployment completed.")
-    except Exception:
-        print("\nFAILURE: Deployment failed.")
-        sys.exit(1)
-
-if __name__ == "__main__":
-    if os.geteuid() != 0:
-        print("This script must be run as root/sudo.")
-        # We don't exit here because the inner run_cmd uses sudo, but it's better to be root.
-    
-    cleanup()
-    create_container()
-    prepare_container()
-    perform_deployment()

www/src/dclogin.js

@@ -0,0 +1,21 @@
+/* dclogin profile generator for self-signed chatmail relays.
+ * Fetches credentials from /new and generates a dclogin: QR code.
+ * Requires qrcode-svg.min.js to be loaded first.
+ */
+(function () {
+    function generateProfile() {
+        fetch('/new')
+            .then(function (r) { return r.json(); })
+            .then(function (data) {
+                var url = data.dclogin_url;
+                var link = document.getElementById('dclogin-link');
+                link.href = url;
+                var qrLink = document.getElementById('qr-link');
+                qrLink.href = url;
+                var qrCode = document.getElementById('qr-code');
+                var qr = new QRCode({ content: url, width: 300, height: 300, padding: 1, join: true });
+                qrCode.innerHTML = qr.svg();
+            });
+    }
+    generateProfile();
+})();

www/src/index.md

@@ -11,6 +11,18 @@ for Delta Chat users.  For details how it avoids storing personal information
 please see our [privacy policy](privacy.html). 
 {% endif %}
 
+{% if config.tls_cert_mode == "self" %}
+<a class="cta-button" id="dclogin-link" href="#">Get a {{config.mail_domain}} chat profile</a>
+
+If you are viewing this page on a different device
+without a Delta Chat app,
+you can also **scan this QR code** with Delta Chat:
+
+<a id="qr-link" href="#"><div id="qr-code"></div></a>
+
+<script src="qrcode-svg.min.js"></script>
+<script src="dclogin.js"></script>
+{% else %}
 <a class="cta-button" href="DCACCOUNT:https://{{ config.mail_domain }}/new">Get a {{config.mail_domain}} chat profile</a>
 
 If you are viewing this page on a different device
@@ -19,6 +31,7 @@ you can also **scan this QR code** with Delta Chat:
 
 <a href="DCACCOUNT:https://{{ config.mail_domain }}/new">
     <img width=300 style="float: none;" src="qr-chatmail-invite-{{config.mail_domain}}.png" /></a>
+{% endif %}
 
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