Check Tweak Settings, should be ‘0’
cat /var/cpanel/cpanel.config |grep skipmailman
skipmailman=0
Deprecated scripts
/scripts/reinstallmailman /usr/local/cpanel/bin/mailman-install --force
Deprecated scripts:
/usr/local/cpanel/scripts/update_local_rpm_versions --edit target_settings.mailman installed /usr/local/cpanel/scripts/check_cpanel_rpms --fix --targets=mailman
The latest way to reinstall mailman on cPanel server:
rpm -e --nodeps cpanel-mailman /usr/local/cpanel/scripts/check_cpanel_rpms --fix --targets=mailman
Run upcp:
/scripts/upcp --force
systemctl start mailman.service
Job for mailman.service failed because a configured resource limit was exceeded. See “systemctl status mailman.service” and “journalctl -xe” for details.
/usr/local/cpanel/scripts/restartsrv --wait mailman
(XID 65jpfh) The “mailman” service is not configured: there are no configured mailing lists
Note. Mailman doesn’t start until the first mailing list is created by a user.
Source: https://forums.cpanel.net/threads/mailman-demystified.444901/
https://forums.cpanel.net/threads/error-starting-mailman.626051/