04 FebAdding Mailman to Postfix with Virtual Domains

I am a big fan of the cut-and-paste howtos provided at howtoforge.com.

I’ve used something like falko’s howto on Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 10.10) in order to get a mail server with those features working on Debian Squeeze.

Then I wanted to add mailman in order to operate mailing lists.

The closest howto for achieving this is the one by Rich Brown, How to add Mailman mailing lists to Postfix under Ubuntu Linux when using virtual domains + virtual users.

I’m going to try to recount what I had to do to go from a working mail server with virtual users and domains (having completed a howtoforge.com howto) to get to that same setup to run mailman. Perhaps some of this was unnecessary, duplicative, or even wrong. But, the mailing lists are working now, so that’s something.

List domain preparation

If the domain that will host the lists is not already served by your setup, be sure you:

  • use phpmyadmin to create the domain example.com in the domains field. NOT lists.example.com!, and
  • add lists.example.com to your dns entry for example.com,

Mailman

As root:

# aptitude install mailman
# newlist mailman
# vi /etc/aliases

And add the following to /etc/aliases:

## mailman mailing list
mailman:              "|/var/lib/mailman/mail/mailman post mailman"
mailman-admin:        "|/var/lib/mailman/mail/mailman admin mailman"
mailman-bounces:      "|/var/lib/mailman/mail/mailman bounces mailman"
mailman-confirm:      "|/var/lib/mailman/mail/mailman confirm mailman"
mailman-join:         "|/var/lib/mailman/mail/mailman join mailman"
mailman-leave:        "|/var/lib/mailman/mail/mailman leave mailman"
mailman-owner:        "|/var/lib/mailman/mail/mailman owner mailman"
mailman-request:      "|/var/lib/mailman/mail/mailman request mailman"
mailman-subscribe:    "|/var/lib/mailman/mail/mailman subscribe mailman"
mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"

# vi /etc/mailman/mm_cfg.py

and uncomment and/or appropriately edit the following lines:

DEFAULT_EMAIL_HOST = 'lists.example.com'
...
DEFAULT_URL_HOST   = 'lists.example.com'
...
MTA=None   # Misnomer, suppresses alias output on newlist
...
GLOBAL_PIPELINE.insert(1, 'SpamAssassin')

Apache2

create a new file: /etc/apache2/mods-available/mailman.conf that looks like this:

ScriptAlias /mailman/ /usr/lib/cgi-bin/mailman/
ScriptAlias /cgi-bin/mailman/ /usr/lib/cgi-bin/mailman/

<Directory /usr/lib/cgi-bin/mailman/>
   AllowOverride None
   Options ExecCGI
   Order allow,deny
   Allow from all
</Directory>

Alias /pipermail/ /var/lib/mailman/archives/public/
<Directory /var/lib/mailman/archives/public>
   Options Indexes MultiViews FollowSymLinks
   AllowOverride None
   Order allow,deny
   Allow from all
</Directory>

Alias /archives/ /var/lib/mailman/archives/public/
<Directory /var/lib/mailman/archives/public>
   Options Indexes MultiViews FollowSymLinks
   AllowOverride None
   Order allow,deny
   Allow from all
</Directory>

Now add a symlink to this file so Apache will use your new Mailman aliases the next time it starts:

# cd /etc/apache2/mods-enabled
# ln -s /etc/apache2/mods-available/mailman.conf mailman.conf

Postfix

Create a new file, /etc/postfix/transport, which contains one line:

lists.example.com     mailman:

Then as root:

# cd /etc/postfix
# postmap transport

Finally edit /etc/postfix/main.cf – add these four lines to the end of the file:
relay_domains = lists.example.com
transport_maps = hash:/etc/postfix/transport
mailman_destination_recipient_limit = 1
unknown_local_recipient_reject_code = 550

Use phpmyadmin to add some aliases in the forwardings field:

mailman@example.com	mailman@lists.example.com
mailman-admin@example.com	mailman-admin@lists.example.com
mailman-bounces@example.com	mailman-bounces@lists.example.com
mailman-confirm@example.com	mailman-confirm@lists.example.com
mailman-join@example.com	mailman-join@lists.example.com
mailman-leave@example.com	mailman-leave@lists.example.com
mailman-owner@example.com	mailman-owner@lists.example.com
mailman-request@example.com	mailman-request@lists.example.com
mailman-subscribe@example.com	mailman-subscribe@lists.example.com
mailman-unsubscribe@example.com	mailman-unsubscribe@lists.example.com

Finishing up

# newaliases
# service apache2 restart
# postfix reload
# service mailman start

After some combination of the above and hopefully not forgetting anything–note my uncertainty there–mailing lists just started working! Go to: http://lists.example.com/mailman/admin/ and get started creating a test list to confirm everything is working.

2 Responses to “Adding Mailman to Postfix with Virtual Domains”

  1. Indy bdplay says:

    I was deadly looking for this thanks for this. I really appreciate this post. thank you.

  2. Anonymous says:

    This helped me correct my Mailman configuration. Now it’s working. Thanks a lot!