Package: mailman3
Version: 3.3.8-2~deb12u1
Severity: normal
File: /usr/share/doc/mailman3/README.Debian
Dear Maintainer,
The instructions for integrating Mailman3 with Postfix include the
following Postfix configuration parameters:
transport_maps = hash:/var/lib/mailman3/data/postfix_lmtp
local_recipient_maps = proxy:unix:passwd.byname $alias_maps
hash:/var/lib/mailman3/data/postfix_lmtp
relay_domains = ${{$compatibility_level} < {2} ? {$mydestination} : {}}
hash:/var/lib/mailman3/data/postfix_domains
However, this appears to be inconsistent and can lead to a situation
where messages addressed to invalid recipients in the Mailman3 domains
are rejected with a mail "loops back to myself" message rather than a
more appropriate "User unknown". This is because local_recipient_maps is
only checked for recipient addresses in the local domain class (e.g.
domains listed in the mydestination parameter) and not for recipient
addresses in the relay domain class (relay_domains).
I believe it is more appropriate to use relay_recipient_maps instead of
local_recipient_maps together with relay_domains, e.g.:
transport_maps = hash:/var/lib/mailman3/data/postfix_lmtp
relay_recipient_maps = hash:/var/lib/mailman3/data/postfix_lmtp
relay_domains = ${{$compatibility_level} < {2} ? {$mydestination} : {}}
hash:/var/lib/mailman3/data/postfix_domains
This configuration causes messages with invalid recipients in the
Mailman3 domains to be properly rejected with "User unknown".
-- System Information:
Debian Release: 12.4
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.1.0-17-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages mailman3 depends on:
ii cron 3.0pl1-162
ii dbconfig-mysql 2.0.24
ii dbconfig-sqlite3 2.0.24
ii debconf [debconf-2.0] 1.5.82
ii init-system-helpers 1.65.2
ii logrotate 3.21.0-1
ii python3 3.11.2-1+b1
ii python3-aiosmtpd 1.4.3-1.1
ii python3-alembic 1.8.1-2
ii python3-authheaders 0.15.2-1
ii python3-authres 1.2.0-3
ii python3-click 8.1.3-2
ii python3-dateutil 2.8.2-2
ii python3-dnspython 2.3.0-1
ii python3-falcon 3.1.1-1+b1
ii python3-flufl.bounce 4.0-3
ii python3-flufl.i18n 3.0.1-3
ii python3-flufl.lock 5.0.1-4
ii python3-gunicorn 20.1.0-6
ii python3-importlib-resources 5.1.2-2
ii python3-lazr.config 2.2.3-3
ii python3-passlib 1.7.4-3
ii python3-public 2.3-4
ii python3-pymysql 1.0.2-2
ii python3-requests 2.28.1+dfsg-1
ii python3-sqlalchemy 1.4.46+ds1-1
ii python3-zope.component 5.1.0-1
ii python3-zope.configuration 4.4.1-1
ii python3-zope.event 4.4-3
ii python3-zope.interface 5.5.2-1+b1
ii ucf 3.0043+nmu1
Versions of packages mailman3 recommends:
ii postfix [mail-transport-agent] 3.7.9-0+deb12u1
Versions of packages mailman3 suggests:
pn anacron <none>
ii lynx [www-browser] 2.9.0dev.12-1
pn mailman3-doc <none>
ii mariadb-server [virtual-mysql-server] 1:10.11.4-1~deb12u1
-- debconf information excluded
