postfix: hardcode IP addresses of relays without DNS, drop messages to nine

README.md

@@ -3,13 +3,23 @@
 
 With this branch, you don't need DNS at all,
 just a VPS with an IPv4 address,
-let's take `77.42.80.106` as an example:
+let's take `77.42.80.106` as an example.
+First, choose a random domain name (it doesn't need working DNS)
+and create a chatmail.ini config file:
 
 ```
 cmdeploy init whatever.you.want
+```
+
+Then, in `cmdeploy/src/cmdeploy/postfix/transport`,
+remove the line corresponding to your relay,
+and add other for relays you know.
+Now you can deploy the relay to your IP address:
+
+```
 cmdeploy run --skip-dns-check --ssh-host 77.42.80.106
 ```
 
-Then you can login with a `dclogin://` code like this:
+Finally, you can login with a `dclogin://` code like this, with the correct "domain name" and IP address:
 
 `dclogin:s0m3r4nd0@whatever.you.want?p=w7i8da7h8uads92ycc2rufyl&v=1&ih=77.42.80.106&sh=77.42.80.106&sp=443&ip=443&ic=3&sc=3`

cmdeploy/src/cmdeploy/postfix/deployer.py

@@ -60,7 +60,19 @@ class PostfixDeployer(Deployer):
             mode="644",
         )
         need_restart |= lmtp_header_cleanup.changed
-
+        # Transport map that discards messages to nine.testrun.org
+        transport_map = files.put(
+            src=get_resource("postfix/transport"),
+            dest="/etc/postfix/transport",
+            user="root",
+            group="root",
+            mode="644",
+        )
+        need_restart |= transport_map.changed
+        if transport_map.changed:
+            server.shell(
+                commands=["postmap /etc/postfix/transport"],
+            )
         # Login map that 1:1 maps email address to login.
         login_map = files.put(
             src=get_resource("postfix/login_map"),

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

@@ -83,6 +83,9 @@ 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/transport
+
 # 1:1 map MAIL FROM to SASL login name.
 smtpd_sender_login_maps = regexp:/etc/postfix/login_map
 

cmdeploy/src/cmdeploy/postfix/transport

@@ -0,0 +1,5 @@
+no-dns.chatmail.at smtp:[77.42.80.106]
+no-dns2.testrun.org smtp:[77.42.86.249]
+
+nine.testrun.org discard:
+* :