Mail Subcommands:
	~e	invoke editor on current message.
	~i	include body of current message, indented.
	~I	include current message with headers, indented.
	~m #	include body of message #, indented.
	~M #	include message # with headers, indented.
	~p	print message entered so far.
	~P	print message entered so far using external pager.
	~s	insert standard signature file.
	~S	insert alternate signature file.
	~?	display this mail subcommand list.
