Announcement

Collapse
No announcement yet.

Sharing an Internet email domain name between AD forests

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Sharing an Internet email domain name between AD forests

    A Company (XYZ) has been bought out by another company (ABC). Company XYZ has an AD Forest with Exchange 2003 installed. Company ABC has Exchange 2007.

    Exchange 2007 has been made authoritative for the Internet domain used by Exchange recipients that exist in Exchange 2003. Some of the mailboxes from Exchange 2003 have been moved to Exchange 2007, so that they still receive emails for the XYZ Internet domain name and now the ABC domain. Exchange 2003 and 2007 are configured to accept emails for the XYZ company. Any email addresses that don't exist in Exchange 2007 for the XYZ company are routed through to the Exchange 2003 system.

    Mailboxes that are still on the XYZ domain are unable to send to XYZ email addresses of mailboxes that have moved to Exchange 2007 and was wondering what best practice was for this setup. Exchange 2007 users are able to send emails to recipients that exist in the Exchange 2003 system.

    All external emails for XYZ domain use a Smart Host, which is probably the issue. However, how should I configure this scenario?

    Thanks and hope the above makes sense.

  • #2
    Re: Sharing an Internet email domain name between AD forests

    You are sharing the SMTP address space.
    Exchange 2003:
    http://support.microsoft.com/kb/321721

    Exchange 2007:
    http://technet.microsoft.com/en-us/l...EXCHG.80).aspx

    Decide which one will accept the email and configure appropriately.

    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
      Re: Sharing an Internet email domain name between AD forests

      Thanks Sembee.

      Exchange 2003 will continue to receive emails for the domain. I am confused with the Exchange 2003 article. Is that relevant to a scenario, if Exchange 2003 is not to remain authoritative?

      For Exchange 2003 to remain authoritative, do I follow the Exchange 2007 article? For routing of emails that exist in Exchange 2007 but not Exchange 2003, I take it that configuring Exchange 2007 as a Smart Host for the delivery of XYZ's SMTP namespace, should then allow emails to route through appropriately?

      I may be missing the point somewhere.

      Comment


      • #4
        Re: Sharing an Internet email domain name between AD forests

        You need to decide where the email is being delivered to and then configure the servers accordingly.

        If the email from the Internet is being delivered to the Exchange 2007 server, then you need to have a mechanism to send email to the Exchange 2003 server.
        Then you need to have a mechanism to get email from the Exchange 2003 server to the Exchange 2007 server.

        However do NOT use the if invalid recipient method for both sides, as that will cause an email loop. Furthermore it also means that you cannot use recipient filtering. Ideally you should be looking to get the users off Exchange 2003 as quickly as possible, sharing the SMTP address space is not something I recommend long term, and when it is done long term I use contacts and a dummy domain.

        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: Sharing an Internet email domain name between AD forests

          Great, thanks Sembee.

          Comment

          Working...
          X