Currently if you receive a message while offline and it gets redirected to email, the subject only says "Message From Second Life".
I have my main account and also shop alt using same email, and I can't tell which one received the message.
Changing the subject to "Message From Second Life - To <avatar name>" would be quite handy. Or even better "Message From Second Life - From <Avatar name> To <avatar name>" as that would allow setting up more complex mail sorting rules etc.