I just got some great feedback from one of our Japanese users.
"I like MailMe. It is very cool!
So, here is my request. Please think about it.
1) Move Prefix "MailMe" from Subject to From (sender's name). And Subject have no prefix.
2) Use only 1st line of Body to Subject.
Great suggestions! We'll definitely look into tagging the message using the senders name field instead of using a subject prefix. Not sure about how it would affect integration with e.g. OmniFocus, which I think is depending on a subject prefix to automate task creation, but that shouldn't be too hard to find out.
Using only the first line of text for MailMe's with several lines of text is also an excellent idea.