Just wanted to make the rest of the GW2 players aware of a bug when mailing items. When you open the mail client and you have typed/selected the person to whom you wish to mail said item too. If you happen to click anywhere on the borders along the item selection window or the items themselves and a player is standing in that location (behind the item or behind the window). When you click on that area, it will change the name of the person to whom you were going to mail the item to that of the person you just happen to hover and click.
It occurred to a couple of people without them even knowing that it happened. Was just made aware when someone contacted me about an item I had mailed them and decided to return it.
I did a quick search and nothing came up that match this issue. hope it helps.