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  • Designing new Email Process

    A company is redesigning their email system, which will look like this:

    Incoming
    1. Internet mail senders
    2. MTA - postfix + various spam processes
    3. MDA - Microsoft Exchange 2010
    4. MUA - Microsoft Outlook & smartphone apps

    Outgoing
    1. MUA - same as incoming
    2. MDA - same as incoming
    3. MTA - same as incoming
    4. Internet recipients

    Special requirements
    1. We have (~100) different domains
    2. The From: header field of all outgoing (reply) messages MUST be automatically identical to the incoming recipient (To address

    Example:
    Incoming To: [email protected]
    Delivered to: Group: example.com
    Group Members: Alice, Bob, Mary, Tom

    Regardless who in Group responds:
    Outgoing From: [email protected]
    Similarly for other incoming To: [email protected]_2.net , [email protected]_3.org , etc.; except, Group members will be different

    Request for Microsoft Exchange solution advice
    How can we configure Groups in Microsoft Exchange to effectively handle these situations?
    We are not currently using Groups & have not found documentation on how to accomplish this

    ~ Mike

  • #2
    You are probably looking at header rewriting.
    However to send back out as the correct group would probably require extensive use of the From field, with the users having Send As permissions on the group.
    Unless you have a group for each domain combination, keeping track of the address for outbound email is going to be impossible.
    If you want to send out as an individual email address based on the incoming domain... I don't even think that is possible without running a huge database for all inbound email so that a database lookup for outbound email can be used and the correct header applied.

    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


    • #3
      Hi, Simon!

      Thank you, for your response.

      What do you think about this method?

      Incoming mail gets delivered via Distribution Groups

      If the To: header remains unchanged at Group member receipt, on Reply use Transport Rules to replace outbound From: header with incoming To: header text

      Could this work?

      NOTE: I need to flesh out a test scenario to pass on to my Exchange admin, since my expertise is on the MTA side ...

      ~ Mike

      Comment


      • #4
        Header rewriting is not available in Exchange transport rules unless you have an Edge server. I wouldn't deploy an Edge role for this functionality only, when you can get it with third party software much cheaper.

        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
          Thank you, Simon, for your response

          To which 3rd party software are you referring?

          ~ Mike

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