I once set up my server using this guide (or a very similar one)
But from time to time I have days or weeks of flooding "Undelivered Mail Returned to Sender" to my inbox. Oh and I am using catch-all mail forward on my domains.
This is an example from the mail:
Reporting-MTA: dns; blah.blah.myserverhost.net X-Postfix-Queue-ID: 6278A33009D8 X-Postfix-Sender: rfc822; firstname.lastname@example.org Arrival-Date: Mon, 20 Oct 2014 08:19:54 +0200 (CEST) Final-Recipient: rfc822; email@example.com Original-Recipient: rfc822;firstname.lastname@example.org Action: failed Status: 5.7.1 Remote-MTA: dns; gmail-smtp-in.l.google.com Diagnostic-Code: smtp; 550-5.7.1 [2001:4ba0:fff8:c2::2 12] Our system has detected that this 550-5.7.1 message is likely unsolicited mail. To reduce the amount of spam sent 550-5.7.1 to Gmail, this message has been blocked. Please visit 550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550 5.7.1 more information. rq6si12888645lbb.21 - gsmtp
I have masked the real hostnames. So they are mails sending from my domain to my domain with random prefixes, like from "email@example.com" to "firstname.lastname@example.org"
With my catch all I receive all that failure notices, as it's detected as spam.
How can I stop getting this emails?