Inserting Letter
Editing Textual
Header
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.