Guys, I have a users sending "on behalf of" another user. He can send it fine. However, when the message is delieverd the sender address is missing from the headers. So when a person reads the messages it doesnt show Joe Smith sent on behalf of Bob Dillion. It just says from bob Dillion. When this users sends other messages on behalf of others the message shows up fine with, Joe Smith on behalf of Bob Dillion.
Any ideas why this is happening?