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550 sorry, no mailbox here by that name (#5.7.17)

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  • 550 sorry, no mailbox here by that name (#5.7.17)

    I have a client who can not receive emails from 1 domain and that is the error. Anybody else can email them fine - but every once in awhile - clients of theirs are getting these kind of bounce backs.
    And yes, they are sending to a valid mailbox.....

    Suggestions? I am leaing towards it being some sort of DNS problem?

  • #2
    Re: 550 sorry, no mailbox here by that name (#5.7.17)

    The message means what it says. The server the message was delivered to does not recognise the mailbox. However what it does not mean is that it was delivered to the correct server. When I have seen this problem before it has occurred when emailing a large ISP who has a cluster of email servers. One of those servers is out of date or doesn't have the latest list of users/domains and rejects the message. Close to nothing you can do about it unless you can track down the exact server that has the problem from SMTP logs and then get the ISP to fix the problem (which they may do but not admit it).

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

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    • #3
      Re: 550 sorry, no mailbox here by that name (#5.7.17)

      The mailbox is there, it's on their SBS2000 server - they only have about 20 users so I'm not sure why they have this problem - but only when they get emails from 1 certain domain.

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      • #4
        Re: 550 sorry, no mailbox here by that name (#5.7.17)

        That isn't an Exchange message.
        I would be looking to check that the only MX records are pointing to the SBS server. If there are any records pointing to other servers (ISP for example) then they should be removed.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
        More Exchange Content: http://exchange.sembee.info/
        Exchange Resources List: http://exbpa.com/
        In the UK? Hire me: http://www.sembee.co.uk/

        Sembee is a registered trademark, used here with permission.

        Comment

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