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292153Re: Trouble configuring backup MX to reject unauth destination

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  • Wietse Venema
    Mar 22 1:55 PM
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      Titanus Eramius:
      > Besides aptget.dk this server also hosts cogky.dk (among others), and
      > while unknown recipients is being correctly rejected with a 550 when
      > sent to aptget.dk, they are not when sent to the other virtual domains.
      > Instead they are accepted and then returned by the MAILER_DAEMON, which
      > in turn opens the server to backscatter.

      Where is cogky.dk defined: mydestination, virtual_alias_domains,
      virtual_mailbox_domains, relay_domains? It must be only one.

      This answer determines where the "known" recipients must be listed:
      local_recipient_maps, virtual_alias_maps,m virtual_mailbox_maps,
      relay_recipients. If you list the domain or recipients in the wrong
      place then mail will be rejected.

      See http://www.postfix.org/ADDRESS_CLASS_README.html

      Wietse
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