Exchange Routing Issues

Posted on 2006-05-02
Last Modified: 2008-01-09
I am having a problem since I shutdown my old E-mail server. When I send mail now I can send e-mail to Hotmail and other external sources but not to Optimum, AOL or some other external domains? Kind of a wierd issue but I want to know how to resolve this.
Question by:Infinityinfo
    LVL 35

    Expert Comment

    could you paste the ndr that you are getting, here
    LVL 35

    Expert Comment

    LVL 1

    Author Comment

    Your message did not reach some or all of the intended recipients.

          Subject:      RE: 5 Fields now on wd sales table
          Sent:      5/2/2006 10:03 AM

    The following recipient(s) could not be reached:

          Mary Lou Teague on 5/2/2006 10:03 AM
                You do not have permission to send to this recipient.  For assistance, contact your system administrator.
                <MAILSERVER #5.7.1 smtp;550 5.7.1 Unable to relay for>

    This is one NDR I have gotten.

    LVL 1

    Author Comment

    and here is another....

    Reporting-MTA: dns;


    Final-Recipient: rfc822;

    Action: delayed

    Status: 4.2.1

    Diagnostic-Code: smtp;452 4.2.1 Your host has no DNS record . If you are using a firewall please configure DNS and try again authoritative host not found:

    Will-Retry-Until: Sun, 30 Apr 2006 09:54:26 -0400

    X-Display-Name: ''

    LVL 4

    Expert Comment

    The problem is could be caused by you not having a reverse DNS entry set up.

    As a temporary fix create a new SMTP connector that sends email to problem domains via you ISPs SMTP server.

    Let me know if you need a hand doing this.

    To check what problems you may have with DNS go to and see what errors/problems it highlights.

    Hope this helps
    LVL 104

    Accepted Solution

    Your DNS is not configured correctly.
    The remote site is bouncing your message because that IP address doesn't have a reverse DNS. Get on the phone to your ISP and ask them to set it for you. If they tell you to speak to your domain name registrar then ask to speak to someone who knows how the internet works.


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