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

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?
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Steve_De
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Steve_De
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1 Solution
 
MegaNuk3Commented:
Do you have a separate SMTP address space? If not you can create one like user@Ipswitch.target and then populate the other email system with these email addresses

You then tell E2k10 to send Ipswitch.target 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
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Steve_DeAuthor Commented:
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
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MegaNuk3Commented:
Thanks for the update. Feel free to close the question
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Steve_DeAuthor Commented:
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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