Variable: rmail-retry-ignored-headers
rmail-retry-ignored-headers is a customizable variable defined in
rmail.el.gz.
Value
"^x-authentication-warning:\\|^x-detected-operating-system:\\|^x-spam[-a-z]*:\\|content-type:\\|content-transfer-encoding:\\|mime-version:\\|message-id:"
Documentation
Headers that should be stripped when retrying a failed message.
This variable was added, or its default value changed, in Emacs 23.2.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/rmail.el.gz
;;;###autoload
(defcustom rmail-retry-ignored-headers (purecopy "^x-authentication-warning:\\|^x-detected-operating-system:\\|^x-spam[-a-z]*:\\|content-type:\\|content-transfer-encoding:\\|mime-version:\\|message-id:")
"Headers that should be stripped when retrying a failed message."
:type '(choice regexp (const nil :tag "None"))
:group 'rmail-headers
:version "23.2") ; added x-detected-operating-system, x-spam