Hello
We've just launched postfix with Mailscanner and spamassasin on our mail server. Everything is working great, but we've encountered very funny and strange problem. We've recieved an email which was classified as spamm by it's sender IP address by RBL list. Additionally sender address didn't pass DMARC verification and had RUF email in it's DNS record. Our mail system based on DMARC DNS record send a DMARC report to that email. However email in that record was invalid, and the destination server bounced it with reason that the user is unknown. This bounced email was sent to us and was also classified as SPAM and was rejected + again didn't pass DMARC verification which resulted in another email with report to the invalid email adress which is in RUF DNS record. You see the point? We got stuck in a loop of sending DMARC reports which are beeing bounced because of unknown user. Is there any way to prevent such situations? Right now we simply blocked that IP address on mail server firewall but this could happen any time again in the future. Anyone every encountered this kind of situation?
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