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550 4.4.7 QUEUE.Expired; message expired

Discussion in 'Web & Email' started by NickSmith, Nov 4, 2008.

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  1. NickSmith

    NickSmith Thread Starter

    Joined:
    Oct 9, 2008
    Messages:
    19
    We have a very important client who when they attempt to mail a user on our domain irregularly get's bounce backs with the message:

    #550 4.4.7 QUEUE.Expired; message expired ##

    The client in question does not appear to have issues mailing anyone else on our domain or any other. I receive all E-mail they send to me. The user here also has no other issues with his mail. As I said, the issue occurs irregularly: some days it's fine, others it's not.

    Does anyone know if this is an issue our end or theirs please?
     
  2. cwwozniak

    cwwozniak Trusted Advisor Spam Fighter

    Joined:
    Nov 28, 2005
    Messages:
    59,609
    First Name:
    Chuck
    I did a Google search for 550 4.4.7 QUEUE.Expired and most of the found pages seem to suggest the problem is most likely with Microsoft Exchange Server on the sending end.
     
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