I am in the process of migrating a chunk of my users off our Exchange server to Google Apps for email. (they have their own domain etc)
I have set up all the new MX records & they have propagated everywhere--so direct email from outside is working fine.
The problem I am running into is with my forwards. Since people in our Exchange server may be trying to email these people still, I removed their email aliases from their AD user object, then I created a contact for each of the users with their SMTP email address. I then forwarded their AD user to the SMTP email address, which I would think would work fine, but I am getting a bounceback whenever I email them internally:
A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients. Contact your administrator. 5.4.6
Any ideas? Exchange 2003 SP2