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The following ~ escapes are defined:
~~		Quote a single tilde.
~b users	Add users to "blind" cc list.
~c users	Add users to cc list.
~d		Read in dead.letter.
~e		Edit the message buffer.
~f messages	Read in messages.
~F messages	Same as ~f, but keep all header lines.
~h		Prompt for to list, subject and cc list.
~r file		Read a file into the message buffer.
~p		Print (show) the message buffer.
~m messages	Read in messages, right shifted by a tab.
~M messages	Same as ~m, but keep all header lines.
~s subject	Set subject.
~t users	Add users to to list.
~v		Invoke display editor on message.
~w file		Write message onto file.
~?		Print this message.
~!command	Invoke the shell.
~|command	Pipe the message through the command and replace it.
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