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The following ~ escapes are defined:
~b name ...	Add names to "blind" Cc: list.
~c name ...	Add names to Cc: field.
~d		Read dead.letter into message.
~e		Invoke text editor on partial message.
~F messages	Same as ~f, but includes all headers.
~f messages	Read in messages.
~h		Edit the header fields.
~M messages	Same as ~m, but includes all headers.
~m messages	Read in messages, right shifted by a tab.
~p		Print (show) the message buffer.
~q		Abort message; optionally save copy to ~/dead.letter.
~r filename	Read a file into the message buffer.
~s string	Set Subject: field to string.
~t name ...	Add names to To: field.
~v		Invoke display editor on message.
~w filename	Write message to file.
~x		Abort message; no copy is saved.
~?		Print a brief summary of tilde escapes.
~!command	Execute shell command.
~|command	Pipe message through command.
~:mail-command	Execute a Mail command.
~~string	Quote a single tilde.
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