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  • Lost inbound mail, even not showing up in the Message Tracking Center

    Hi,
    Messages from a certain sender are not arriving to our Exchange 2003 (SBS 2003). Even not showing up in the Message Tracking Center (MTC).
    In spite of that the sender gets delivery notification.

    Now - in order to diagnose the issue - we have temporarily stopped the SMTP service to force messages to arrive to another Server (with the secondary MX address). (This other Mail Server belongs to another ISP.)
    The messages have arrived there!

    Please help me to diagnose the case:
    Does the fact that the message is not showing up in the MTC means for sure that the message did not reach our server?
    Or can it be the case that our server somehow blocks or "swallows" this messages and it even does not shows them in the message tracking center?

    Or could it mean that somehow a Mail server in between does not relay the message from specific senders to our server?

    Thanks in advance,
    petardo

  • #2
    Re: Lost inbound mail, even not showing up in the Message Tracking Center

    Are you using the IMF?

    Comment


    • #3
      Re: Lost inbound mail, even not showing up in the Message Tracking Center

      Yes, my colleague uses Intelligent Message Filter, and the update is turned on via registry modification.

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange]
      "ContentFilterState"=dword:00000001

      Comment


      • #4
        Re: Lost inbound mail, even not showing up in the Message Tracking Center

        If the message is not in Message Tracking then Exchange did not receive the message.
        Even if IMF blocked the message, that would show in Message Tracking.

        Delivery reports cannot be trusted.
        Do you receive email directly, or through another host?
        Is something else scanning the SMTP traffic? Firewall for example? Does something else receive email and then hand it over to Exchange?

        The message was blocked/dropped before it was handed over to Exchange, so you have to look outside Exchange as the cause of the problem.

        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


        • #5
          Re: Lost inbound mail, even not showing up in the Message Tracking Center

          Thanks!
          Originally posted by Sembee View Post
          Do you receive email directly, or through another host?
          Directly.
          Originally posted by Sembee View Post
          Is something else scanning the SMTP traffic? Firewall for example? Does something else receive email and then hand it over to Exchange?
          No.
          The server is connected through a Linksys WRT54gl router (Tomato firmware) to the Internet. No other host, no extra firewall, just the Servers Basic firewall and the Router.

          Comment


          • #6
            Re: Lost inbound mail, even not showing up in the Message Tracking Center

            Without knowing what server issued the delivery location, as far as I can tell the problem is elsewhere. If you are using a basic router and there are no third party applications on the server that could be getting in the way, and email is delivered directly to your server and not to another host, then I don't know what the problem is.

            SMTP logging on the SMTP virtual server MIGHT show the connection being made, but it is pretty rare for something to show in the SMTP logs and not in message tracking.

            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: Lost inbound mail, even not showing up in the Message Tracking Center

              If the IMF is set to Reject, will the message still show up in Message Tracking?

              Comment


              • #8
                Re: Lost inbound mail, even not showing up in the Message Tracking Center

                Now I have checked the Exchange settings and found some ip-s in the global settings/delivery/Accept list, inherited from the previous administrator. At that time only mails from their server were accepted. Could this cause the issue? (Deny list was empty!)

                Comment


                • #9
                  Re: Lost inbound mail, even not showing up in the Message Tracking Center

                  As far as I am aware, if the message is rejected by IMF it will show that the message was rejected.

                  As for the question about IP address acceptance, that should be empty unless email from the server is being filtered by another server or service (a hosted spam filtering service for example).

                  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: Lost inbound mail, even not showing up in the Message Tracking Center

                    Originally posted by Sembee View Post
                    As for the question about IP address acceptance, that should be empty unless email from the server is being filtered by another server or service (a hosted spam filtering service for example).
                    Simon.
                    But it was not empty!! Now I have cleared.

                    So - Is it possible that this caused the issue?

                    Comment


                    • #11
                      Re: Lost inbound mail, even not showing up in the Message Tracking Center

                      Now another possibility of source of the issue: ! ?

                      I have managed to get sent a letter from one of the critical sender addresses.

                      Did not arrive.

                      BUT!!!

                      It have arrived to the MX2 server.
                      And I have set to pull messages from the secondary server every 15 minutes, so it arrived to our server at 19:00.

                      Actually I have not got the previous messages before, before the postbox of that specific user was not present on the secondary server.

                      Now that I created the missing postboxes on the secondary server, the messages routed to MX2 will be pulled every 15 minutes.

                      So the original issue reduces to the following:

                      Why are the messages from certain server routed to the lower priority (20) secondary server instead of our server (priority 10)?

                      Comment


                      • #12
                        Re: Lost inbound mail, even not showing up in the Message Tracking Center

                        As far as I am concerned, the priority level on MX records cannot be trusted. All MX servers will receive email. Set them all the same, or don't bother. If you have a server set in the MX records you need a way to get all email to the primary server.

                        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: Lost inbound mail, even not showing up in the Message Tracking Center

                          Hey, You want to know what was the real resaon?

                          Server certificate missing ==> TLS connection refused (can be seen in smtp log, but not in MTC!) ==> repeat sending to MX2 ==> missing postbox there.

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