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  • Reply To: not working sometimes

    This is a strange one and if I hadn't seen it with my own eyes I would think it impossible.

    We have a client with Exchange 2007 and two domains (domainone.com and domaintwo.com).

    They are a large organisation with about 100 users.

    In most cases everything works as one would expect except for about 6 recipient domains where the following occurs.

    1. They can send a new email to either domain and it arrives okay.
    2. They can reply to mail from domainone.com and it arrives.
    3. If they click 'reply to' on mail from domaintwo then it doesn't arrive.
    4. In the latter case they get no bounce and my client does not see it hit their mail server at all.
    5. MX records are identical for both domains.
    6. The headers are correct and most recipients don't have this problem.

    Anybody able to shed some light/ideas?

    Many thanks

    Colin
    Last edited by colinjack; 22nd July 2010, 19:01.
    Colin

  • #2
    Re: Reply To: not working sometimes

    100 users isn't large. 10,000 is large. 100 for Exchange is tiny. I run a number bigger than that.

    If you are the recipient then there is nothing that you can do if the email doesn't appear in message tracking. Email is like having a package delivered. Until the delivery man hands it to you, it is completely out of your control. The sending side has to check their logs and prove the message was delivered to your server - the logs should show the SMTP header. Until delivery is shown, nothing you can do.

    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: Reply To: not working sometimes

      Sorry Simon - I wasn't thinking when I said large ... what I meant was not a 10 user setup.

      I am familiar with how email works - that is what I find so strange. I cannot see why the very large majority of their clients have no problem but these half dozen cannot reply but can send if they start a new email to the same email address as on the 'reply to'. I just wondered if anybody had seen this before - because it doesn't make any sense to me.

      Second domain, same recipients, no problem.

      I have checked all the headers and they are fine. The fact that most don't have this problem supports this. It can be replicated (otherwise I wouldn't believe it) with these specific clients.
      Last edited by colinjack; 22nd July 2010, 19:08.
      Colin

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      • #4
        Re: Reply To: not working sometimes

        If you are the recipient, there is nothing to work on. The senders need to diagnose from their end. Until the message arrives at your server it is out of your control.
        If they show the message was delivered to your server, then you start hunting. There are simply too many things that can cause email delivery to fail, most of which are out of your control.

        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: Reply To: not working sometimes

          I agree entirely.

          The only thing that I find odd is that the one domain works fine and the other only has a problem with replies. Same server, same user, same mx. Odd.

          One of the 'Problem Six' is fairly local and I have suggested that my client sends a member of their IT Dept around to troubleshoot from the other end.

          Thanks for your help Simon. Much appreciated.
          Colin

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