Please note, Plesk has supported the version of Mailman provided by OS vendor by default.
The Mailman 3 is shipped by default on Ubuntu 18 and Debian 10.
Please keep voting if this request is still actual for you.
An error occurred while saving the commentUwe Sinha commented
Any news about mailman 3? Now that Debian has dropped mailman 2 from bullseye it's REALLY time for Plesk to support mailman 3 as well!