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.
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