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  • Exchange 2007 Undelivered report

    Need a little help with the Undelivered report that users get when a bogus email address is sent to my company. As of now the report shows all the IP address and name of the servers. How can this be change not to show the DMZ IP and info?

  • #2
    Re: Exchange 2007 Undelivered report

    Originally posted by hlobell View Post
    Need a little help with the Undelivered report that users get when a bogus email address is sent to my company. As of now the report shows all the IP address and name of the servers. How can this be change not to show the DMZ IP and info?
    You may be able to use a transport rule to modify this. Certainly in Ex2010 you can. Although i can't remember if Ex2007 has a transport rule that can modify headers. That being said obfuscating headers likely contravenes the best practices as defined in the RFC.
    Ideally you need to tackle the root cause of the issue and why uses are getting NDR's. Sounds like backscatter to me. Can you provide the content of the NDR or at least a bit of background as to nature of these 'bogus' emails?

    Comment


    • #3
      Re: Exchange 2007 Undelivered report

      Your best option is to do recipient filtering on whatever is accepting email from the internet. It sounds like you aren't at the moment.
      Is it Exchange accepting email, or do you have something else?
      If you are seeing the information in the NDR then it sounds like you accept email and then NDR it, which is backscatter and will get you blacklisted.

      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


      • #4
        Re: Exchange 2007 Undelivered report

        Originally posted by Sembee View Post
        Your best option is to do recipient filtering on whatever is accepting email from the internet. It sounds like you aren't at the moment.
        Is it Exchange accepting email, or do you have something else?
        If you are seeing the information in the NDR then it sounds like you accept email and then NDR it, which is backscatter and will get you blacklisted.

        Simon.
        I have a spam filter in front of my Exchange server.

        Comment


        • #5
          Re: Exchange 2007 Undelivered report

          Originally posted by scurlaruntings View Post
          You may be able to use a transport rule to modify this. Certainly in Ex2010 you can. Although i can't remember if Ex2007 has a transport rule that can modify headers. That being said obfuscating headers likely contravenes the best practices as defined in the RFC.
          Ideally you need to tackle the root cause of the issue and why uses are getting NDR's. Sounds like backscatter to me. Can you provide the content of the NDR or at least a bit of background as to nature of these 'bogus' emails?
          The NDR's are from a client sending mail to my domain but they have the wrong user account ID.

          Comment


          • #6
            Re: Exchange 2007 Undelivered report

            My previous answer still stands.
            If you have a spam filter in front of Exchange, then it needs to be configured to do recipient validation. I would consider any spam filter that is UNABLE to do that not fit for purpose. This maybe via an LDAP lookup.
            Once you configure the spam filter correctly this will not be a problem.

            Filtering/rejecting at Exchange is too late.

            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: Exchange 2007 Undelivered report

              Originally posted by Sembee View Post
              My previous answer still stands.
              If you have a spam filter in front of Exchange, then it needs to be configured to do recipient validation. I would consider any spam filter that is UNABLE to do that not fit for purpose. This maybe via an LDAP lookup.
              Once you configure the spam filter correctly this will not be a problem.

              Filtering/rejecting at Exchange is too late.

              Simon.
              Thank's Sembee I'm using GFI mail Essentials and have it configured to do LDAP look up and I managed Control what the NDR report shows.

              Comment

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