I have a incident where User1 sent a e-mail to user2 and the e-mail was delivered to user2 but also got delivered to 9 other users. In the POA logs the Message ID's Match the sent item but looking at the sent item it only shows the one user that it is going out to. Another thing is that User1 is in a separate domain as user2 and the 9 other users the received it are in a different domain from both user1 and user2.

Any Ideas?