Summary
With mail servers, Just forwarding emails to multiple addresses is easy. Also, we can build an advanced mailing list system. This post is about how to build a GNU Mailman server on OpenBSD.
Environment
Tutorial
The package manager is available and useful because it provides well-configured setting files as well as applications. Just run:
# pkg_add mailman
The result is:
quirks-3.325 signed on 2020-06-04T16:43:21Z
mailman-2.1.32:python-2.7.18p0: ok
mailman-2.1.32:py-setuptools-41.6.0v0: ok
mailman-2.1.32:py-dnspython-1.16.0p2: ok
File /var/spool/mailman/data/sitelist.cfg could not be installed:
No such file or directory
mailman-2.1.32: ok
The following new rcscripts were installed: /etc/rc.d/mailman
See rcctl(8) for details.
New and changed readme(s):
/usr/local/share/doc/pkg-readmes/mailman
Well, it is useful to read /usr/local/share/doc/pkg-readmes/mailman above.
Then, edit the config file:
# # (optional) make a backup beforehand:
# # cp -p /usr/local/lib/mailman/Mailman/mm_cfg.py /usr/local/lib/mailman/Mailman/mm_cfg.py.org
# nvim /usr/local/lib/mailman/Mailman/mm_cfg.py
to add the lines in the end of the file:
# Put YOUR site-specific settings below this line.
+ MAILMAN_GROUP = '_mailman'
+ MAILMAN_USER = '_mailman'
It is because, without them, the errors below occur at starting the mailman daemon:
gid = grp.getgrnam(mm_cfg.MAILMAN_GROUP)[2]
KeyError: 'getgrnam(): name not found: '
uid = pwd.getpwnam(mm_cfg.MAILMAN_USER)[2]
KeyError: 'getpwnam(): name not found: '
Next, you need to create the first list in order to escape from the error at starting the mailman daemon:
Site list is missing: mailman
The detail is here in the official documentation.
Run the Mailman command:
# /usr/local/lib/mailman/bin/newlist mailman
which is followed by:
Enter the email of the person running the list: <[email protected]>
Initial mailman password:
To finish creating your mailing list, you must edit your /etc/aliases (or
equivalent) file by adding the following lines, and possibly running the
`newaliases' program:
## mailman mailing list
mailman: "|/usr/local/lib/mailman/mail/mailman post mailman"
mailman-admin: "|/usr/local/lib/mailman/mail/mailman admin mailman"
mailman-bounces: "|/usr/local/lib/mailman/mail/mailman bounces mailman"
mailman-confirm: "|/usr/local/lib/mailman/mail/mailman confirm mailman"
mailman-join: "|/usr/local/lib/mailman/mail/mailman join mailman"
mailman-leave: "|/usr/local/lib/mailman/mail/mailman leave mailman"
mailman-owner: "|/usr/local/lib/mailman/mail/mailman owner mailman"
mailman-request: "|/usr/local/lib/mailman/mail/mailman request mailman"
mailman-subscribe: "|/usr/local/lib/mailman/mail/mailman subscribe mailman"
mailman-unsubscribe: "|/usr/local/lib/mailman/mail/mailman unsubscribe mailman"
Hit enter to notify mailman owner...
In order to follow the messages, edit it:
# nvim /etc/mail/aliases
and run:
# newaliases
/etc/mail/aliases: xx aliases
As it is written in /usr/local/share/doc/pkg-readmes/mailman, it is necessary to add a group to the MTA user:
# usermod -G _mailmanq _smtpd
It is almost done.
Well, optionally, I had two additional modification.
#1. I had to modify /etc/mail/smtpd.conf to let OpenSMTPD accept requests from egress to the mailing list domain.
I modified /etc/mail/smtpd.conf like:
...
listen on egress \
tls pki <pki> \
auth-optional \
tag MTA
...
action "local" maildir alias <aliases>
...
+ match tag MTA from any for domain "<fqdn>" action "local"
...
#2. I set up default list settings.
# nvim /usr/local/lib/mailman/Mailman/mm_cfg.py
# Put YOUR site-specific settings below this line.
...
+ DEFAULT_URL_HOST = '<mail-server-fqdn>'
+ DEFAULT_EMAIL_HOST = '<mailing-list-domain>'
+ add_virtualhost(DEFAULT_URL_HOST, DEFAULT_EMAIL_HOST)
Let’s start the mailing list system:
# rcctl -f -d start mailman
doing _rc_parse_conf
doing _rc_quirks
mailman_flags empty, using default >-s start<
doing _rc_parse_conf /var/run/rc.d/mailman
doing _rc_quirks
doing rc_check
mailman
doing rc_start
doing _rc_wait start
doing rc_check
Starting Mailman's master qrunner.
doing _rc_write_runfile
(ok)
Now you may operate lists via command line :)
The commands MailMan provides are here.
For example, running /usr/local/lib/mailman/bin/newlist <list-name> will create your first list.
Have you decided to use Mailman? If so, the last steps are registering cron jobs and enabling the daemon to let it start at boot.
# crontab -u _mailman /usr/local/lib/mailman/cron/crontab.in
# rcctl enable mailman
Thank you for your reading. I hope you enjoy the networks :)