NDR’s are sent to Badmail

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    SnijdeA
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    #143377

    All,

    I have an SBS 2003 server in my own office.
    When I send an e-mail, from some webmail on the internet, to a non existing address in my domain, my mailserver sends an NDR back.

    A client fo mine has an SBS 2003 server in his own office.
    When I send an e-mail, from some webmail on the internet, to a non existing address in his domain, his mailserver sends an NDR back.

    All fine.

    Another client of mine also has an SBS 2003 server in his office.
    When I send an e-mail, from some webmail on the internet, to a non existing address in his domain, his mailserver sends an NDR (as I can see in Message Tracking Center) but that is sent to Badmail, it never reaches the sender.

    When I change the Small Business SMTP connector to “Use DNS to route each address space on this connector”, it does work and I do get the NDR back.
    But we want to use the smarthost, in this case smtp.xs4all.nl.

    All 3 servers are all behind a DSL line of the same ISP (XS4ALL).

    Why does this 1 server drop NDR’s in Badmail when using the smarthost ?

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