tried to write a test to test exceeded quota, but not sure delta even gets a proper error on recipient's full mailbox

deploy-chatmail/src/deploy_chatmail/dovecot/dovecot.conf.j2

@@ -4,11 +4,14 @@ protocols = imap lmtp
 
 auth_mechanisms = plain
 
-auth_verbose = yes
-auth_debug = yes
-auth_debug_passwords = yes
-auth_verbose_passwords = plain
-auth_cache_size = 100M
+mail_plugins = quota
+mail_debug = yes
+
+# uncomment this if you want to debug authentication and user creation
+#auth_verbose = yes
+#auth_debug = yes
+#auth_debug_passwords = yes
+#auth_verbose_passwords = plain
 
 # Authentication for system users.
 passdb {
@@ -60,13 +63,28 @@ mail_privileged_group = vmail
 # Enable IMAP COMPRESS (RFC 4978).
 # <https://datatracker.ietf.org/doc/html/rfc4978.html>
 protocol imap {
-  mail_plugins = $mail_plugins imap_zlib
+  mail_plugins = $mail_plugins imap_zlib imap_quota
+}
+
+protocol lmtp {
+  mail_plugins = $mail_plugins quota
 }
 
 plugin {
   imap_compress_deflate_level = 6
 }
 
+plugin {
+  # for now we define static quota-rules for all users 
+  quota = maildir:User quota
+  quota_rule = *:storage=100M
+  quota_max_mail_size=30M
+  quota_grace = 0
+  quota_over_flag_value = TRUE
+}
+
+
+
 service lmtp {
   user=vmail
 

online-tests/test_1_deltachat.py

@@ -1,3 +1,8 @@
+import os.path
+import random
+import time
+
+
 class TestMailSending:
     def test_one_on_one(self, cmfactory, lp):
         ac1, ac2 = cmfactory.get_online_accounts(2)
@@ -9,3 +14,32 @@ class TestMailSending:
         lp.sec("wait for ac2 to receive message")
         msg2 = ac2._evtracker.wait_next_incoming_message()
         assert msg2.text == "message0"
+
+    def test_exceed_quota(self, cmfactory, lp, tmpdir):
+        ac1, ac2 = cmfactory.get_online_accounts(2)
+        chat = cmfactory.get_accepted_chat(ac1, ac2)
+
+        ac2.set_config("download_limit", 1024 * 2)  # set download_limit to 2 KB avoid downloading all those 5MB files
+
+        lp.sec("ac1: send 25 5 MB files to ac2")
+        alphanumeric = "abcdefghijklmnopqrstuvwxyz1234567890"
+        for i in range(25):
+            attachment = tmpdir / f"attachment{i}"
+            with open(attachment, "w+") as f:
+                for j in range(1024 * 1024 * 5):
+                    f.write(random.choice(alphanumeric))
+
+            print("Sent out msg", str(i))
+            chat.send_file(str(attachment))
+
+        ac2.wait_next_incoming_message()
+        lp.sec("ac2: check that at least one message failed")
+        failed = False
+        for i in range(25):
+            if chat.get_messages()[i].is_out_failed():
+                failed = True
+                print(chat.get_messages()[i].get_message_info())
+        try:
+            assert failed
+        except:
+            import pdb; pdb.set_trace()

plan.txt

@@ -2,13 +2,10 @@
 
 ## Dovecot goals/steps
 
-2. (holger) per-user storage quota (adaptive)
-   a) define a static 100MB per-user quota
-
-3. automatic expiry of messages older than M days
+- automatic expiry of messages older than M days
    - delete unconditionally messages older than 40 days
 
-4. limit: max-connections per account
+- limit: configure max-connections per account
 
 
 ## Filtermail

scripts/get_imap_capabilities.py

@@ -7,7 +7,7 @@ domain = os.environ.get("CHATMAIL_DOMAIN", "c3.testrun.org")
 print("connecting")
 conn = imaplib.IMAP4_SSL(domain)
 print("logging in")
-conn.login(f"measure{time.time()}", "pass")
+conn.login(f"imapcapa", "pass")
 status, res = conn.capability()
 for capa in sorted(res[0].decode().split()):
     print(capa)