I am moving about 500 users from FirstClass to Exchange; however, we cannot move everyone at once and would like to do so in waves of 100 users. Is there a way to route mail to different servers based on email alias?


You can configure your Exchange Server to send mails to a "smarthost" if there is no mailbox with the email address in your exchange organization.

you have to set the accepted-domain to "InternalRelay"

Here is a article that describes the necessary steps


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