We have Exchange 2010 SP2, with the following Roles: Hub Transport, Client Access and Mailbox Roles. (No Edge Transport). I have a request for emails that are generated from our monitoring environment to have the 'from' address changed to our support email address, which is sent to our external clients.
Email account generated from server: firstname.lastname@example.org
Change the from to show as: email@example.com
In looking at the Transport Rules on the Exchange server, there is no place to do this. I looked at the AddressRewriteEntry command, but since I do not have the Edge Transport role installed I don't think I have this as an option.