previous mail gets sent again when previous mail has same subject as current mail #122
Description
Repro:
Player1 sends mail with topicA and textA to Player2
Player2 sends mail with topicA and textB to Player2
Wrong: Player2 receives topicA and textA in the first mail, and then topicA and textA in the second mail
Expected: Player2 receives topicA and textA in the first mail, and then topicA and textB in the second mail
for my reference 5504