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It's been many years since I've run my own mail server, but especially if you are running your mail server on a public cloud, you should make sure you aren't on any blacklists like Spamhaus: https://www.spamhaus.org/lookup/

EDIT: Looks like this is one of the things https://glockapps.com/ checks.

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I already did check my IP. It's not in any known list. But thanks :)

Also check the IPs of your neighbours (in the same subnet or network block). I suspect the big ISPs also look at this, and on Hetzner at least I've found many neighbours with somewhat spammy IPs.

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