421 invalid sender domain error

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    Exch Server 2007, on Windows 2003 Standard Ed.

    DC’s are Windows 2003 Standard Ed as well.

    In Exchange, under Queue Viewer I get the following error while trying to send to some outside domains. All other domains receive mail from our domain just fine.

    Identity: BMP-EXCH3752162312894
    Subject: RE: Lambda Problems
    Internet Message ID: < [email protected]om>
    From Address: xxxxx@metrohmusa.com
    Status: Ready
    Size (KB): 20
    Message Source Name: FromLocal
    Source IP:
    SCL: -1
    Date Received: 8/4/2009 9:00:58 AM
    Expiration Time: 8/6/2009 9:00:58 AM
    Last Error: 421 invalid sender domain ‘metrohmusa.com’ (misconfigured dns?)
    Queue ID: BMP-EXCH375216
    Recipients: [email protected]

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