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  • Queue errors

    Mails from my Exchange 2010 server to some particular domains were hanging in the queue. When I made a switch of my sending hub transport server to Exchange 2007 by editing the source server on the Send Connector, the mails flew out of the queue. After 24hrs the 421 4.4.2 Connection dropped errors are still evident even on the 2007 Hub transport server. I still cant figure out what the problem is.
    Below are some logs from the SmtpSend transport logs.

    Sending Mail to Yahoo:
    #local address#:,98.137.54.238:25,>,HELO #mydomain.com#
    #local address#:98.137.54.238:25,<,250 mta1060.mail.sp2.yahoo.com
    #local address#:98.137.54.238:25,*,80,sending message
    #local address#:98.137.54.238:25,>,MAIL FROM:<#me#>,
    #local address#:,98.137.54.238:25,<,250 sender <#me#> ok
    #local address#:98.137.54.238:25,>,RCPT TO:<[email protected]>,
    92.168.220.22:48068,98.137.54.238:25,<,250 recipient <[email protected]> ok,
    #local address#:48068,98.137.54.238:25,>,DATA,
    #local address#:48068,98.137.54.238:25,<,354 go ahead,
    #local address#:51839,209.85.143.27:25,<,451 4.4.2 Timeout - closing connection. m53si6769786wej.87,
    #local address#:51839,209.85.143.27:25,>,RSET,
    #local address#:51839,209.85.143.27:25,-,,Remote
    74.125.79.27:25,*,,attempting to connect
    #local address#:48069,74.125.79.27:25,+,,

    Other Domains(gmail):
    213.199.180.150:25,<,451 4.7.0 Timeout waiting for client input,
    213.199.180.150:25,>,RSET
    213.199.180.150:25,-,,Remote
    135.245.0.37:25,-,,Remote
    _____________________________________________
    192.160.6.149:25,<,"354 Enter mail, end with ""."" on a line by itself",
    attempting to connect

  • #2
    Re: Queue errors

    firewalls or anti-virus I would posit.
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    • #3
      Re: Queue errors

      Okay. Would it my on premises firewall or at the remote end?
      Some mails leave the queue but some stay in queue. I have uninstalled McAfee, and even tried some other troubleshooting methods by still the same problem.

      Comment


      • #4
        Re: Queue errors

        since it's occuring on a variety of remote hosts, i'd speculate that it's probably something at your end.
        Please do show your appreciation to those who assist you by leaving Rep Point https://www.petri.com/forums/core/im.../icon_beer.gif

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        • #5
          Re: Queue errors

          Okay. Firewall is configured to allow port 25 out.
          In your best knowledge what other configurations could block smtp traffic out on a Cisco ASA firewall?

          Comment


          • #6
            Re: Queue errors

            Ciscos has a feature called SMTP Fixup or Mailguard, depending on the OS version. That is well known for causing problems with email delivery with Exchange servers and should be disabled.

            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: Queue errors

              Okay. I would clarify with my network admin on this and get back with the result.
              Thanks.

              Comment


              • #8
                Re: Queue errors

                Just an update on this. When I configured the Send connector for my domain to use one Exchange 2007 Hub transport server. The mails flew out of the queue, almost instantly.
                After 24 hours the queues started again. When I swapped the Source Server to use the Exchange 2010 server, the queues flew out again.
                What could be the cause of this, its as if there is a congestion somewhere in my network or in public DNS?
                Any comment on this would be so helpful.

                Comment


                • #9
                  Re: Queue errors

                  Without knowing what the errors in the queue said, and whether there was any errors in the event viewer it is hard to say. Usually once configured correctly email will flow throughout. It could be that your ISP is blocking something, or a lack of disk space, all sorts of things can be the cause.

                  The mail flow troubleshooter in the toolbox can sometimes diagnose issues.

                  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


                  • #10
                    Re: Queue errors

                    thanks for the post.
                    When I run the mail flow troubleshooter on the exchange 2010 server, I get the error that I don't have a correct SPF record, and also I dont have a PTR record configured.
                    I seem to get it all confused with the SPF record, I have researched and that I have to add, the txt record of (v=spf1 mx -all) in the Enom register of my domain. I added the TXT record but didn't reduce the queues.
                    How important is the PTR record and where do I correctly configure it, should it be done at my ISPs end or my local DNS?
                    Thanks.

                    Comment


                    • #11
                      Re: Queue errors

                      Both SPF and Pointer record should be set at your ISPs DNS, but the SPF record should not be the root cause since not that many companies set a hard delete for wrong SPF records or missing SPF records.

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                      • #12
                        Re: Queue errors

                        Originally posted by FischFra View Post
                        Both SPF and Pointer record should be set at your ISPs DNS, but the SPF record should not be the root cause since not that many companies set a hard delete for wrong SPF records or missing SPF records.

                        Not quite correct.

                        The PTR is set only by the ISP, but can only be set on a static IP address. If the OP is on a dynamic IP address then a smart host will have to be used.

                        However the SPF record is set on the DNS for the domain, which may or many not be with the ISP. I don't have any of the domains I manage with an ISP as I don't like them to control the domain.

                        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


                        • #13
                          Re: Queue errors

                          Thanks for the guides, I would make sure these PTRs are configured correctly and talk to my ISP on any DNS resolution problems.
                          Much appreciated.

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