I am trying greylisting for the first time.. I tried a test mail from gmail to a customer, and I see this in the logs, and nothing else afterwards (it's been 15 minutes) May 26 12:48:34 localhost postfix/smtpd[1936102]: NOQUEUE: reject: RCPT from mail-ed1-f48.google.com[209.85.208.48]: 451 4.3.5 <[email protected]>: Recipient address rejected: Server configuration problem; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail-ed1-f48.google.com> Is that the normal behavior? or did I misconfigure something in postfix? (I did lots of changes to the default postfix configs)
I guess there is a configuration issue. It might also be that Gmail does not retry in time, but rejection reason "Server configuration problem" does not look right to me. In general, Rspamd does greylisting internally already when spam score is in an intermediate level between ok and spam, so I would not use separate greylisting in postfix with postgrey anymore today.
You should really check what's going on with your server. This indicates trouble with your server or postfix configuration. Check the mail.log for error or fatal log lines and see what's going on.
