Inserting messages
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   Messages can be inserted with `C-c C-i' (`mh-insert-letter').  This
command prompts you for the folder and message number and inserts the
message, indented by `> '.  Certain undesirable header fields are
removed before insertion.  If given a prefix argument (like `C-u C-c
C-i'), the header is left intact, the message is not indented, and `> '
is not inserted before each line.