I have exchange 2010 and for a long time had only one domain. We will say domain1.com. We created a new shell company within our organization and added the new domain2.com to exchange. Now the way i went about setting this up was creating new mail boxes and giving the first user rights to view the mail box with the other address. I should also note that I made new users adding 1 after the username. the user will never log in with this, but that was the way I was able to create the mailbox. For example, email@example.com has rights to view Paul@domain2.com. Then in his outlook he can view both boxes and send from either one via the send as right. The reasons I have separate mail boxes was at some point I may need to export from a certain company. It was important to my boss to have separate contacts and calendars. Anyways everything is working as it should. the user can send out from either address. The only issue is the sent items always show up in the domain1.com mailbox. Is there a way when doing a send as to place in domain2.com mailbox? If not, what steps should I take to make this happen?