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Two nitpicks: you don't need to set myhostname; many mailservers will think you less spammy if your hostname is mail.$mydomain.

Thank you, but I set it, because myhostname is "fulla.localdomain" if I don't set it.

Which goes to show that you can still get it wrong after verifying locally (hostname typically does return a FQDN on OpenBSD)...