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If you are sending mail from within mail command mode, you can enclose the contents of any message sent to you by using ‘~m’ or ‘~M’ commands. Typing ‘~m’ alone will enclose the contents of the current message, typing ‘~m 12’ will enclose the contents of message #12 and so on.
The ‘~m’ uses retained and ignored lists when enclosing headers, the ‘~M’ encloses all header fields.
In both cases, the contents of indentprefix mail variable is
prepended to each line enclosed.