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Single Sender Receives 554 Denied [CS]

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  • Single Sender Receives 554 Denied [CS]

    Hello,
    I am using exchange 2003 and having a very weird problem with one user.
    Every time he sends me an email it bounces back with the message below
    ---------
    From: [email protected]
    Date: July 11, 2011 11:39:29 AM PDT
    To: [email protected]
    Subject: Delivery Status Notification (Failure)


    This is an automatically generated Delivery Status Notification.

    Delivery to the following recipients failed.
    [email protected]
    user2@domain.org


    Reporting-MTA: dns;domain.org Final-Recipient: rfc822;[email protected] Action: failed Status: 5.5.0 Diagnostic-Code: smtp;554 Denied [CS] (Mode: normal) X-Display-Name: [email protected] Final-Recipient: rfc822;[email protected] Action: failed Status: 5.5.0 Diagnostic-Code: smtp;554 Denied [CS] (Mode: normal) X-Display-Name: [email protected]

    ------------------------

    It was working fine 2 days ago but today for some unknown reasons it started to do this. Also I have checked and me (the recipient of that email) can receive all other emails from the outside world without any problems. I tired 5 different domains and got all of the 5 emails not a single one bounced back. Same goes for the sender. He emailed 4 different people and they all got his emails. So to make long story short. He can send to everyone except for me (it bounces back with the message I described above). I receive emails from everybody else except for him.

    Please help.

    Many thanks

  • #2
    Re: Single Sender Receives 554 Denied [CS]

    That doesn't look like an Exchange error to me.
    Therefore I would have to presume that either the email is being sent to the wrong server, or something on your server is blocking it.
    Nothing much you can do from your side, as you can't diagnose it. If the sender is running their own server then they can do an MX record lookup for your domain and compare it with what it should be, and ensure that the correct servers and IP addresses are listed.

    Thread title updated to be more descriptive.

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
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    Sembee is a registered trademark, used here with permission.

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