Symptoms

You get the error on Plesk CP during new mailing list creartion:

ERROR: PleskFatalException
Up LevelUp Level
Unable to execute listmng utillity: listmng: Error: cannot create new list: is
Mailman configured properly?

or the following error during mailman startup:

/usr/lib/mailman/bin/mailmanctl start
Site list is missing: mailman

Resolution

- First of all try to reconfigure Mailman with Plesk. To do it, remove main Mailman list:



Then go to "Server->Set Up Mailman" and input requested information.

- If it does not help check that MAILMAN_ROOT_D/Mailman/mm_cfg.py and MAILMAN_ROOT_D/Mailman/Defaults.py do not contain the record like MTA = 'Postfix'.

Plesk uses Qmail MTA but Mailman has no built in Qmail support, so you should comment that line and leave MTA = 'Manual' in MAILMAN_ROOT_D/Mailman/Defaults.py then restart Mailman.

MAILMAN_ROOT_D folder vary depending on operating system and can be known from /etc/psa/psa.conf file.