We have two users that each have new phones:

Samsung Galaxy SIII
Samsung Galaxy Note II

When they use the default email app and connect through the Mobility Server any e-mail that they send using the phone is sent to their own account as well. For example:
On phone Message TESTA is sent to by ( in to box, in from, nothing in CC or BC)
Once the message is sent TESTA is in's box BUT it also appears in mailbox and it says FROM: TO:

I just had one of them install the GW Mail app and the problem is not observed.

Is this a problem with the default Samsung email app or is there something we should change on Mobility Server?

We are running the latest Mobility Server. We have verified that the auto CC is turned off on the phone.