After moving mailboxs from 2007 to 2010 some rights users had are gone. Like the right for user B to send as user A.
"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. If the problem continues, please contact your helpdesk."
Do these all need to be reset up?
Thanks, Grady Vogt
