MAILER-DAEMON Backscatter on alias mail domains

Discussion in 'Installation/Configuration' started by Athi, Mar 10, 2020.

  1. Athi

    Athi New Member

    Hi everyone!
    I have a problem with backscatter. If a domain is configured as an alias-domain mails to unknown users get an MAILER-DAEMON eMail back for users not known to the destination domain. I didn't find a good solution to this problem so far, my main.cf seems to be proper configured since the destination domain works fine with all rejects.

    Can someone help please?

    Server: Debian 10.1, Postfix 3.4.7, Current ISPConfig
     
    Athi, Mar 10, 2020
    #1
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Use email aliases for existing addresses only instead of aliasing a whole domain.
     
    till, Mar 10, 2020
    #2
  3. Jesse Norell

    Jesse Norell Well-Known Member Staff Member Howtoforge Staff

    This seems worth filing an issue for, as it should be pretty doable to query valid recipients based on the destination domain (I think (not positive) by combining queries to mail_forwarding and mail_access tables).
     
    Jesse Norell, Mar 10, 2020
    #3

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