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Download the mailman-2.1.39 tarball, uncompress it, then compile it and install it: Fix permissions with:

Configure apache, use HTTPS through letsencrypt. In bind, create A record for ml.ninux.org Use certbot to obtain a letsencrypt certificate:

In main.cf Use apache letsencrypt certificates also for postfix In master.cf

We use OpenDKIM Generate a 2048 bits key /etc/opendkim.conf The DNS entry to be added to bind is in /etc/mail/dkim-keys/ml.ninux.org/mail.txt

Verify with dig, e.g.