So I was forwarded an email from x that he received from y. I replied to the email, and instead of x receiving the email, y received it. y is not in my address book, and I did not type his address into the recipient. I'm trying to figure out if there was a key combination or something that took his address from the original email header and put it into the recipient list. I have never seen this happen before. Although this was not a sensitive email, it could have been so I want to make sure this doesn't happen again. I will certainly be more careful to check the recipients before I hit send. Any help is greatly appreciated.