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Recipient verification method flawed

JonEtkins
Yesterday I set up a small distribution list on my mail server, but this morning I was informed that every incoming mail intended for that list was being bounced with a 550 "Unknown recipient".

Further investigation revealed that Astaro uses a "bouncing mail from..." inquiry to the back-end mail server for the purposes of checking for valid addresses, but my mail server does not regard distribution lists as valid bounce recipients, and thus fails the inquiry.

My mail server is Mailtraq, but I suspect that it is probably not unique in this behavior.

Meanwhile, I'm left with the choice of either disabling recipient verification or adding exceptions for every distribution list I create, unless anyone has any better suggestions.


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  • 0
    I understand now - I thought you thought the Astaro was doing recipient verification on email sent from inside the local network, but you really are talking about inbound email.

    I don't know what the standard is.  It works fine with Exchange, and that's the only mail server I really know anything about.

    Another thought... Have you tried changing your distribution addresses to something like Jim-and-Jill-list@domain.com and then putting the list@domain.com pattern into 'Mail Security >> Quarantine Report', 'Exceptions' tab, 'Define internal mailing lists'?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    I understand now - I thought you thought the Astaro was doing recipient verification on email sent from inside the local network, but you really are talking about inbound email.

    I don't know what the standard is.  It works fine with Exchange, and that's the only mail server I really know anything about.

    Another thought... Have you tried changing your distribution addresses to something like Jim-and-Jill-list@domain.com and then putting the list@domain.com pattern into 'Mail Security >> Quarantine Report', 'Exceptions' tab, 'Define internal mailing lists'?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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