Exchange and Outlook 2010
User reported not being able to send as another user (same person) after being able to for quite some time. User belongs to 2 domains, occasionally this user needs to be able to send as the same person but in a different domain. Ex. email@example.com and firstname.lastname@example.org.
So I have send as, send on behalf of, and even full access permissions enabled for the user for the other domain. The user tries to send as or on behalf of and gets this error "You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission."
I have tried removing the permissions and applying them again with no luck. I even created 2 new test mailbox accounts (1 per domain) and applied the same permissions and send as works flawlessly. I don't think its AD permissions (but I could be wrong).
Is there an easy way to "fix" the users mailbox (in the case that its corrupt) or something else I can troubleshoot to figure out the problem?
Let me know if you need more info.