Reading Mail with Rmail
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Rmail is an Emacs subsystem for reading and disposing of mail that
you receive. Rmail stores mail messages in files called Rmail files.
Reading the message in an Rmail file is done in a special major mode,
Rmail mode, which redefines most letters to run commands for managing
mail. The command `rmail-mode' is used to switch into Rmail mode, and
it runs the hook `rmail-mode-hook' as usual, but don't run this command
by hand; it can't do a reasonable job unless the buffer is visiting a
proper Rmail file.