We've been using Mailman to host our mailing lists for decades. Since Mailman2 has become obsolete a while ago, it's time to move to Mailman3.
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Gmail recently blocked a legit email originating from my server. It seems they have again raised the bar to be able to use their services, and it's time to setup DKIM signing for my private server (running Exim4).
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Due to the increasing amount of classic mail providers (including, e.g. gmail) requiring a proper SPF/DKIM/DMARC setup to accept mails, the DSA team (the Debian System Administrators, that run the Debian infrastructure) has set up an SMTP submission server. This blog explains how to use it with Exim4.
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