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Recipient address rejected: User unknown in relay recipient table

    Question

  • Hi,

    We have created above 40000 contacts (only domain @xxx.org) in our exchange 2010. The problem is that we are facing some delivery failed message only when sending to some of those contacts...sometimes its delivered and sometime not.

    Errors: 550 5.1.1 <ContactEmailAddress>: Recipient address rejected: User unknown in relay recipient table

    Flow of our emails: CAS1 (Main Site) --> CAS2 (DR Site) --> Mail gateway --> Internet

    Any help on this pls?

    Regards,


    -- Regards Ahsan Kamal | MCITP

    Sunday, August 18, 2013 7:39 AM

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