The header fields specified by mh-new-draft-cleaned-headers are
removed from an old draft that has been recreated with M-e
(mh-extract-rejected-mail) or M-a (mh-edit-again).
If when you edit an old draft with these commands you find that there
are header fields that you don't want included, you can append them to
this variable. For example,
(setq mh-new-draft-cleaned-headers
(concat mh-new-draft-cleaned-headers "\\|^Some-Field:"))
This appends the regular expression `\\|^Some-Field:' to the variable (see section `Syntax of Regular Expressions' in The GNU Emacs Manual). The `\\|' means or, and the `^' (caret) matches the beginning of the line. This is done to be very specific about which fields match. The literal `:' is appended for the same reason.
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