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.
AAMichael Pauly commented
That would really be great. I have a huge problem with yahoos DMARC policy and only mailman version 2.1.12 which has no option to do handle this problem :)Michael Pauly supported this idea ·