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  • 500 Unrecognized command Error

    Hello,
    I am transitioning from Exchange 2003 to 2007. I currently have the 2 servers running simultaneously. For some reason now, we cannot send any messages to hotmail. We get the following error message:

    Sent by Microsoft Exchange Server 2007






    Diagnostic information for administrators:

    Generating server: XXXXXX.xxxx.XXXX.xx.XXXX

    {removed email address}
    SNT0-MC1-F16.Snt0.hotmail.com #500 Unrecognized command ##


    Original message headers:

    Received: from XXXXX.xxxxx.XXXX.xx.xx ([::1]) by
    XXXXX.xxxxx.XXXX.xx.xx ([::1]) with mapi; Mon, 1 Jun 2009 10:50:10 -0400
    From: "EMPLOYEE @ DOMAIN"
    To: "{removed email address}" <{removed email address}>
    Date: Mon, 1 Jun 2009 10:50:04 -0400
    Subject: helo
    Thread-Topic: helo
    Thread-Index: AcniyD+KRU4gmySaSV+tGknsfdPnJg==
    Message-ID: <{removed email address}>
    Accept-Language: en-US, en-CA
    Content-Language: en-US
    X-MS-Has-Attach:
    X-MS-TNEF-Correlator:
    acceptlanguage: en-US, en-CA
    Content-Type: multipart/alternative;
    boundary="_000_376D9F0ABC8E6E45BA98896784737164025 2C474MOOSElibrarygue_"
    MIME-Version: 1.0




    Internet Headers:

    MIME-Version: 1.0
    From: <{removed email address}>
    To: <{removed email address}>
    Date: Mon, 1 Jun 2009 10:50:10 -0400
    Content-Type: multipart/report; report-type=delivery-status;
    boundary="40f4a134-a51a-4833-8e10-984e5c535773"
    X-MS-Exchange-Organization-SCL: -1
    Content-Language: en-US
    Message-ID: <6089bc1d-3add-4351-a9b9-583d35f70908>
    In-Reply-To: <{removed email address}>
    References: <{removed email address}>
    Thread-Topic: helo
    Thread-Index: AcniyD+KRU4gmySaSV+tGknsfdPnJgAAAPME
    Subject: Undeliverable: helo


    Any Help would be greatful.

  • #2
    Re: 500 Unrecognized command Error

    Anyone?!!?

    Comment


    • #3
      Re: 500 Unrecognized command Error

      What does the NDR say? Have you got the correct PTR records in place for your MX? If not send it via Smarthost (your ISP).

      Comment


      • #4
        Re: 500 Unrecognized command Error

        The NDR is in my first post.

        Everything seems to be setup right. I don't understand, we can send and receive email from everyone but we can't send to hotmail accounts.

        What information do I need to setup Smarthost?

        Comment


        • #5
          Re: 500 Unrecognized command Error

          What is between the server and the internet?
          It would be rather silly of Microsoft to have one of their flagship products unable to email their own email service, so it has to be interference. Firewall scanning SMTP traffic is the prime candidate.

          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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