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  • moving from ISP Pop mail to exchange

    I'm planning to move from our ISP pop mail to an inhouse Exchange FE/BE setup.I can't change out our.org name so I thought that I would set the exchange MX record to a lower number than the current isp mail server and move over users a few at a time. Will mail check the lowest MX record and then the next higher, ie the ISP server or will users who have not yet been moved over get an undeliverable message.

  • #2
    Re: moving from ISP Pop mail to exchange

    The users that you have not setup on exchange will have all there emails bounced. Unless you want to setup a split domain, I would just setup all the accounts on exchange first and then migrate the data. In other words MX priority only checks for the existence of a server not for user accounts.
    "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

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    • #3
      Re: moving from ISP Pop mail to exchange

      Would a split domain allow me to move users a few at a time? I'd have to relay to ISP Pop. Can Exchange's SMTP relay only valid addresses?
      Thanks

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      • #4
        Re: moving from ISP Pop mail to exchange

        If you intend to keep the mx record pointing to your ISP email servers also (it is a good point, your ISP has a higher bandwidth and availability than you) emails sent to your domain should be forwarded to your front-end exchange server.

        For outgoing mail flow, you can choose between direct mail delivery or to use your ISP's mail server as a SMART host.
        Regards,
        Csaba Papp
        MCSA+messaging, MCSE, CCNA
        ...............................
        Remember to give credit where credit is due and leave reputation points where appropriate
        .................................

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        • #5
          Re: moving from ISP Pop mail to exchange

          Would a split domain allow me to move users a few at a time? I'd have to relay to ISP Pop. Can Exchange's SMTP relay only valid addresses?
          Thanks
          A split domain would work however all the time spent setting it up would be better spent migrating. Can you clue us in as to why you insist on migrating your users one at a time. How many users are we talking about?
          "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

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          • #6
            Re: moving from ISP Pop mail to exchange

            Switching MX records around doesn't work how people think it will.
            If you have two servers in the MX records then both servers will receive email. There is nothing that you can do to stop that.

            Therefore you will need to come up with a strategy for co-existing.

            There are various methods to that, the most suitable would depend on how many users there are.

            My personal preference though is the big bang approach - where everything is switched across in one hit. Users who haven't had their Outlook changed can use OWA until you get to their machines.

            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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