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The following ~ escapes are defined:
~c users Add users to cc list
~e Edit the message buffer
~h Prompt for to list, subject and cc list
~r file Read a file into the message buffer
~p Print the message buffer
~m messages Read in messages, right shifted by a tab
~t users Add users to to list
~v Invoke display editor on message
~w file Write message onto file.
~!command Invoke the shell
~|command Pipe the message through the command
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