Postfix rejects incoming e-mails with 450 Server configuration error

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I've just wondered about this error message in my Postfix logs and couldn't at the begin figure out, why I see these error messages. It happened for EVERY incoming e-mail, therefore they were temporary rejected. I googled but couldn't find anything relating until I realized that postgrey (Greylisting function for Postfix) was not started. So if you are using Postgrey on your mailserver and you see "450 Server configuration problem" in your maillogs, check that Postgrey is actually running ;-)

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