Hello, Ispconfig does not look like supporting mailman3, which is the only provided version of mailman on Debian Bullseye. How can we have again mailing list with ISPConfig on Debian Bullseye?
Currently, we don't plan to support mailman 3 as the mailinglist feature is not used by many users in ISPConfig. But if someone wants to add Mailman 3 support, then feel free to submit a Mailman 3 plugin and support for configuring it in the installer at git.ispconfig.org. Or you can try to install mailman 2 on Debian 11, which is probably possible as well, in this case, it will work in ISPconfig as long as you use the same paths for config files and binaries that were used on Debian 10.
Done by installing mailman and python-dnspython Buster packages from snapshot.debian.org: http://snapshot.debian.org/archive/.../m/mailman/mailman_2.1.29-1+deb10u1_amd64.deb http://snapshot.debian.org/archive/...hon/python-dnspython_1.16.0-1+deb10u1_all.deb Not the cleanest way to do but it works and I don't think it could cause any major issue.
As it uses Django, I am not sure how mailmain3 would easily work with ISPConfig. I might simply drop it in the future as I also personally don't use it that much.
