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  • can not send email to some domains

    We are using exchange server 2000 and server 2000 domain controller. one user using outlook 2003 sent a email to [email protected] and the mesage bounced back:
    Your message did not reach some or all of the intended recipients.

    Subject: Qwest cell phone
    Sent: 4/19/2007 11:11 AM

    The following recipient(s) could not be reached:

    '[email protected]' on 4/19/2007 11:11 AM
    There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
    <loki.ucpofaz.com #5.5.0 smtp;554 <unknown[206.169.201.134]>: Client host rejected: rDNS/DNS validation failed. Please setup matching DNS and rDNS records:

    When I went to dnsreport.com and run a dns report on our domain name I got this warning: loki is name of exchange

    WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

    mail.ucpofaz.org claims to be non-existent host loki.ucpofaz.com:
    220 loki.ucpofaz.com Microsoft ESMTP MAIL Service, Version: 5.0.2195.6713 ready at Thu, 19 Apr 2007 14:53:13 -0700

    any help

  • #2
    Re: can not send email to some domains

    You need to ask your external DNS provider to set up a "PTR Record" for your mail server.

    An "A" record is a name with an associated IP address. A "PTR" record is an IP address with an associated name. Some organisations require there to be a PTR record referring to your mail server to exist before they will accept mail from you. Also, you are sending out mail claiming to be "mail.ucpofaz.com" when your server is actually called "loki.ucpofaz.com". Make the two the same.

    I have just tried to ping loki.ucpofaz.com and it could not resolve the name. In other words, the entire internet thinks your mail server is called mail.ucpofaz.com; there is no DNS record at all for loki. I would personally remove all references to LOKI and stick with "mail.ucpofaz.com" - and set up a PTR record for it.
    Last edited by Stonelaughter; 19th April 2007, 23:15.


    Tom
    For my own and your protection, I do not provide support by private message under any circumstances. All such messages will be deleted and ignored.

    Anything you say will be misquoted and used against you

    Comment


    • #3
      Re: can not send email to some domains

      thank you, I'll give them a call.

      Comment


      • #4
        Re: can not send email to some domains

        See my post again I've added some stuff - cheers!


        Tom
        For my own and your protection, I do not provide support by private message under any circumstances. All such messages will be deleted and ignored.

        Anything you say will be misquoted and used against you

        Comment


        • #5
          Re: can not send email to some domains

          Could you provide any information or website links on how to make these changes.

          Thank you,

          Comment


          • #6
            Re: can not send email to some domains

            The error message means there is a lack of reverse DNS. You do not set the reverse DNS entries, your ISP does. You will have to phone them up and ask them to set the reverse DNS for you.

            If they tell you to speak to your domain name registrar, then ask to speak to someone who understands how the internet works.

            I have never seen a control panel or other web based tool for setting a reverse DNS record.

            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


            • #7
              Re: can not send email to some domains

              Sembee - what about "loki" not existing on the internet?


              Tom
              For my own and your protection, I do not provide support by private message under any circumstances. All such messages will be deleted and ignored.

              Anything you say will be misquoted and used against you

              Comment


              • #8
                Re: can not send email to some domains

                I have contacted my ISP there are fixing the PTR record and will set the reverse DNS.

                Thanks for all the help

                Comment


                • #9
                  Re: can not send email to some domains

                  I'm guessing Loki is the internal name of the exchange server, hense why it's not pingable (is pingable a word?)

                  Am I right?

                  Comment


                  • #10
                    Re: can not send email to some domains

                    loki is name of exchange

                    Comment


                    • #11
                      Re: can not send email to some domains

                      If the server is announcing itself as loki.ucpofaz.com and that name doesn't resolve on the internet, then it will be rejected by some servers.

                      You need to ensure that all three elements resolve correctly, preferably to the same IP address...

                      forward DNS
                      reverse DNS
                      SMTP ehlo (which is also often the SMTP banner).

                      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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