Just checked one more time that emails from my server are accepted by Gmail. What am I doing wrong?

the list of the daemons running in docker-mailserver

Awful. Who heeds both rspamd and spamassassin simultaneously? fetchmail and getmail6? More than a half of these components are not required to get a working mail server. But I agree that setting up the another half is rather complicated. So I’m planning to give a try to mox when I’ll need to set up a new mail server.