Each outgoing message indicated as "sending 4 of 4 messages"
Sometimes when I send one email with Messages (Mavericks) to one receipient, the Mail Activity box (bottom left) displays:
"Sending 4 messages of 4"
Am I being hacked and each of my emails is being sent 4 times (3 to unknown receipients), or it's just a bug?
Mail-OTHER, OS X Mavericks (10.9)