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NDR's not going to original sender, only "admin".

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  • NDR's not going to original sender, only "admin".

    Since we migrated mailboxes from 2003 server to 2007 server, we are noticing this behaviour with NDR's.

    If someone sends to an invalid address, the bounce message winds up in Administrator's mailbox; there is no indication of a delivery problem for the original sender.

    To make sure it wasn't our spam filter or firewall, i sent to the same invalid email address from a non-exchange (unix sendmail) machine and received the "no such user" info back promptly to the sender.

    The way it is now, Exchange users don't really have any idea when they send an email off, that it had a mis-spelling or otherwise did not get delivered.

    i found where you list the status codes for which you want messages sent, and added the really common ones, but to no avail.

    Can anyone assist?

  • #2
    Re: NDR's not going to original sender, only "admin".

    It isn't 100% clear - is this OUTBOUND or INBOUND messages.

    So an external user sending to [email protected] yourdomain or a user inside sending to a non-existent user at an external host.

    If it is the former, then ensure that you have recipient filtering enabled.
    If it is the latter, then things become more tricky because of the different ways that NDRs can be generated.

    Certainly NDRs should go back to the original sender, if they are not then something has been changed, either as part of the configuration of the server or by a third party tool.

    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.

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    • #3
      Re: NDR's not going to original sender, only "admin".

      Sorry about the confusion, the situation is in fact the second of your scenarios

      On our Exchange system, a user sends outbound to an invalid address, say "[email protected]", and the returning incoming NDR from Yahoo gets delivered only to our Exchange Administrator's inbox and not to the user who sent to the invalid address.

      I have poked around and not found much.

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      • #4
        Re: NDRs not going to original sender, only "admin".

        The first thing you need to do is see if Exchange is doing this itself.
        The only way that I can think of is that outlined in this Technet article:

        http://technet.microsoft.com/en-us/l...EXCHG.80).aspx

        Are you using a third party utility for antispam management?

        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: NDR's not going to original sender, only "admin".

          Very sorry i took so long in responding, and telling everyone what happened.

          Yes, we have a third party anti-spam device from Barracuda, but ndr's were not getting blocked or quarantined. I checked; it was a good thought.

          The problem is resolved now. I had forgotten was that we still had an Exchange 2003 machine in the site, and the internet connector was running on that. When the internet connector got switched to the 2007 hub transport machine, we started seeing the delivery status reports (ndrs) showing back up in user's mailbox as appropriate.

          I don't know EXACTLY why that fixed it, but since the 2003 machine is going away, i'm happy with the solution.

          And i thank everyone for their ideas; that technet article was a good read.

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