Automatic reply for full email and suspended emails causing poor reputation

Hedloff

• October 18, 2017 07:49

I often see alot of spam mails sent to our customers. Some customers have their email accounts full and some have suspended for example outgoing emails. When that email address gets a spam email, the server will then return the mail and body to that sender: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: user@domain.tld LMTP error after end of data: 452 4.2.2 Mailbox is full / Blocks limit exceeded / Inode limit exceeded: retry timeout exceeded ++ body Often emails are spoofed from sender address and since the body is returned to a user that didn't send that email in the first place it will be marked as spam. And in some cases our servers get "poor reputation" og "blacklisted". I asked cPanel about this, but they had no solution :-( Does anyone have a working solution? In my opinion this is something that cPanel should use resources to find a better solution.

• 

  cPWilliamL

  • October 18, 2017 13:38

  Is this regarding a specific RBL? Unfortunately, the issue of backscatter is a bit complicated. Using blackhole would eliminate any backscatter, but it could also cause issues with legitimate mail. Using ':fail:' is expressed in the RFC, but this leads to backscatter. Have you tried using Greylisting? Greylisting - Version 66 Documentation - cPanel Documentation

  0
• 

  Hedloff

  • October 18, 2017 13:42

  Yes, on :fail we have gotten it sorted as that also cause more servers blacklisted all over the place. Greylisting is a terrible service that just caused alot of headache and pain for us and customers, so no, I will not test that again!

  0

Please sign in to leave a comment.