migrating to Exchange 2010 - trouble sending emails to internal users on old system

Posted on 2011-05-11
Last Modified: 2012-05-11
We are about to migrate from IPSwitch to Exchange 2010.  I have set everyone up in Exchange.  We were hoping to migrate people department by department rather than trying to do 170 users all at once.  Sending emails out from exchange to the outside world and receiving in from the outside world, works fine.

This issue we are having is trying to send from internal users on Exchange to internal users who are not yet using it.  Those who are not using Exchange yet, do not receive the emails on the old email system.

I have tried disabling the non Exchange user's mailboxes, but then we get errors that the user doesn't exist and they still don't get the emails.

Exchange is simply trying to email within itself for internal users.  I need to know if anyone knows of a way to make exchange email to a separate non-Exchange internal email system.

Any thoughts?
Question by:Steve_De
    LVL 31

    Expert Comment

    Do you have a separate SMTP address space? If not you can create one like and then populate the other email system with these email addresses

    You then tell E2k10 to send email address space mail to the Ipswitch server

    Then create contacts in E2k10 with the above email address and set the unmigrated mailboxes to forward to the contact

    When you migrate the mailbox the forward and contact can be removed

    Accepted Solution

    we had to delete the user mailboxes in exchange until we actually convert them and then set up an internal send connector in exchange to look to the old email system
    LVL 31

    Expert Comment

    Thanks for the update. Feel free to close the question

    Author Closing Comment

    User's can't be setup in exchange until they are ready to use it.  Exchange had to have an internal send connector configured to look to the current email system.

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