Dat mailman that does not accomplish his own policy.
But yeah, the 2 gold coins thingy was just an indication of how to do his job I guess.
I have, like 6.5 alts to feed, y'know. A man's gotta support his family.
That being said mail service is really totally anonymous. I don't see any point in divulging names unless it's requested as part of the message.
EDIT: I just remembered something. As an extra service, you may actually pay an extra 2 coins for requesting a reply--the recipient does not need to pay in this case if they choose to not do so, but they MUST respond within the next day or the service will be refunded to the sender.