Some requests for a future version:

Receipt Notification (notify sender that recepient read message)

Make a folder with an R or such so that we know we responded to a specific message

If there are no messages in your folder it says "Last message from" and then nothing, have this say 'nobody' or such. Should only do this if I have never received a message (see below)

If I delete all of my messages it should remember who my last message was from and reflect that in the "Last Message from"