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by dizhn 6 days ago
I had the same experience. Since 2008 or so on Hetzner of all places too. Their IP reputation is supposed to be shit if you believe any HN post about self hosting. I had issues maybe 3 times. The most recent of which was 2 weeks ago. I read the message, sent the postmaster of a German telecom my two IPs and they added them to their whitelist. That was it. Also postfix+dovecot+rspamd is enough. I have rspamd on the gateway that passes on clean mail to my real mail server.

The comments (not parents') are usually very weird like people are mad at us for hosting our own mail server or something. That is really an interesting phenomenon.