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Issues with Exchange 2003 after change to Domain, ISP, and Hosting solution

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  • Issues with Exchange 2003 after change to Domain, ISP, and Hosting solution

    First time posting, I am trying to be as specific as possible but am frankly stumped and not sure what path to follow for resolution.

    Here is the scenario:

    Working on Exchange on a Microsoft Windows Server 2003 for Small Business SP2 Active Directory Environment.
    Client changed ISP, Domains, and Hosting solutions for their business, but hosts their own MS Exchange. The MX record has been updated to point to the correct mail server and this has been verified with NSLOOKUP as well as TELNET.

    When client sends email the internet message header reflects messages being sent from unknown sender and the prior mail domain and looks like this:
    Received: (qmail 9623 invoked from network); 13 May 2009 17:51:08 -0000
    Received: from unknown (HELO xxx.xxx.xxx.xxx.net) ([###.###.##.166])
    (envelope-sender <[email protected]>)
    by xxx.xxx.xxx.xxx.net (qmail-1.03) with SMTP
    for <[email protected]>; 13 May 2009 17:51:08 -0000
    Received: (qmail 8945 invoked from network); 13 May 2009 17:51:01 -0000
    Received: from unknown (HELO BADMAIL.net) ([##.###.#.34])
    (envelope-sender <[email protected]>)
    All the email addresses are good, the IPs are the correct IPsS, the only issues is reflected in this portion of the message header:
    Received: from unknown (HELO BADMAIL.net)
    Not an expert in Exchange, can follow instructions well, but for some reason cannot figure out how to make this reflect the right information.
    Thanks in advance for any assistance.

  • #2
    Re: Issues with Exchange 2003 after change to Domain, ISP, and Hosting solution

    Probably a lack of reverse DNS on the IP address from the ISP. You need to speak to the ISP and get them to set a reverse DNS aka PTR record on the IP address, ideally to match the host name used for MX records.

    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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