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Automatic reply for full email and suspended emails causing poor reputation

Discussion in 'E-mail Discussions' started by Hedloff, Oct 18, 2017.

  1. Hedloff

    Hedloff Well-Known Member

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    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 <user@domain.tld> 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.
     
  2. cPWilliamL

    cPWilliamL cP Technical Analyst II
    Staff Member

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    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
     
  3. Hedloff

    Hedloff Well-Known Member

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    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!
     
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