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550 5.7.1 Unable to relay for [email protected]

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  • 550 5.7.1 Unable to relay for [email protected]

    I looked through and saw someone else had this problem but that solution of restarting IIS services didn't work.

    We currently have 3 domains mx records pointed to our email server, exchange 2003 FE and BE setup.

    The problem seems to be with the second and third domain, not the main domain. People that send from those domains are getting the unable to relay message alot lately.

    This started happening last week, but no change has been made and it's been working fine for the last 3 years.. yes there is a recipte policy entry..

    any other thoughts or solutions..

    Thanks

  • #2
    Re: 550 5.7.1 Unable to relay for [email protected]

    Turn diagnostic logging for SMTP to maximum and look for SMTP events in the event log. Post any errors or warnings from the logs here.

    Comment


    • #3
      Re: 550 5.7.1 Unable to relay for [email protected]

      I think my server might actaully be comprimised, does anyone know a good way to verify this..

      exchange 2003 sp 2

      Thanks

      Comment


      • #4
        Re: 550 5.7.1 Unable to relay for [email protected]

        Originally posted by stup88 View Post
        I think my server might actaully be comprimised, does anyone know a good way to verify this..

        exchange 2003 sp 2

        Thanks
        you can try an AV solution, first off. that will help to prevent and diagnose intrusions and malware infections.

        second... you can try the Exchange BPA. that will show some weaknesses in your setup, according to m$.

        third, you could employee a 3rd party app like GFI NSS. this will do a pretty decent scan of your srvs settings and show any problems. it is available for a trial download.

        fourth, you can use some basic tools to see whats up. like TCPView. see what ports are bound to what applications and if any look suspect, then investigate further.
        its easier to beg forgiveness than ask permission.
        Give karma where karma is due...

        Comment


        • #5
          Re: 550 5.7.1 Unable to relay for [email protected]

          Ditto would just change order of 1st and second from previous post. BPA is more likely to tell you if your server has been compromised. AV well hopefully thats already running on your server.
          Leave 'reputation' when deserved :

          Comment


          • #6
            Re: 550 5.7.1 Unable to relay for [email protected]

            BPA is best practice analyzer correct ?

            Comment


            • #7
              Re: 550 5.7.1 Unable to relay for [email protected]

              yes. for more info ...

              http://www.computerperformance.co.uk...2003_ExBPA.htm
              Leave 'reputation' when deserved :

              Comment


              • #8
                Re: 550 5.7.1 Unable to relay for [email protected]

                Well I continue to get these messages so I contacted MS, opened a ticket, at first glance they didn't see anything but ticket remains open for me to send them more SMTP log info.. but thanks to everyone that has helped

                Comment


                • #9
                  Re: 550 5.7.1 Unable to relay for [email protected]

                  Check the IIS settings for SMTP -- may resolve your problem:

                  In the IIS (Admin Tools - IIS)
                  Right Click in Default SMTP Server
                  Properties
                  Acces Tab
                  In Relay Restrictions click Relay
                  Choose -> All Except the list below
                  OK - Apply
                  Stop and Start SMTP Server

                  Comment


                  • #10
                    Re: 550 5.7.1 Unable to relay for [email protected]

                    Originally posted by stup88 View Post
                    I looked through and saw someone else had this problem but that solution of restarting IIS services didn't work.

                    We currently have 3 domains mx records pointed to our email server, exchange 2003 FE and BE setup.

                    The problem seems to be with the second and third domain, not the main domain. People that send from those domains are getting the unable to relay message alot lately.

                    This started happening last week, but no change has been made and it's been working fine for the last 3 years.. yes there is a recipte policy entry..

                    any other thoughts or solutions..

                    Thanks
                    check your IIS settings for SMTP

                    In the IIS (Admin Tools - IIS)
                    Right Click in Default SMTP Server
                    Properties
                    Acces Tab
                    In Relay Restrictions click Relay
                    Choose -> All Except the list below
                    OK - Apply
                    Stop and Start SMTP Server

                    Comment

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