-----------
The following topics describe the guts of the LambdaCore mail system
sending-mail -- how to send mail from a program; what happens.
mail-forwarding -- how to do mail forwarding/notification (the simple version)
mail-resolve -- how mail forwarding/notification works, in gory detail
receiving-mail -- what :receive_message should do
mail-format -- format of transmitted messages
mail-command-parsing (TODO) -- routines for parsing mail commands
$mail_recipient -- generic non-player mail recipient
$mail_agent -- mail utility object