Variable: nnmail-extra-headers
nnmail-extra-headers is a customizable variable defined in
nnmail.el.gz.
Value
(To Newsgroups Cc)
Documentation
Extra headers to parse.
In addition to the standard headers, these extra headers will be included in NOV headers (and the like) when backends parse headers.
This variable was added, or its default value changed, in Emacs 24.3.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/nnmail.el.gz
(defcustom nnmail-extra-headers '(To Newsgroups Cc)
"Extra headers to parse.
In addition to the standard headers, these extra headers will be
included in NOV headers (and the like) when backends parse headers."
:version "24.3"
:group 'nnmail
:type '(repeat symbol))