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]*:\\|^arc-.*:\\|^content-type:\\|^content-transfer-encoding:\\|^mime-version:\\|^message-id:\\|^x-google-smtp-source:\\|^x-received:\\|^received-spf:\\|^authentication-results:\\|^dkim-signature:"
Documentation
Headers that should be stripped when retrying a failed message.
This variable was added, or its default value changed, in Emacs 29.1.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/rmail.el.gz
;;;###autoload
(defcustom rmail-retry-ignored-headers
(concat "^x-authentication-warning:\\|^x-detected-operating-system:\\|"
"^x-spam[-a-z]*:\\|^arc-.*:\\|"
"^content-type:\\|^content-transfer-encoding:\\|"
"^mime-version:\\|^message-id:\\|^x-google-smtp-source:\\|"
"^x-received:\\|^received-spf:\\|"
"^authentication-results:\\|^dkim-signature:")
"Headers that should be stripped when retrying a failed message."
:type '(choice regexp (const :value nil :tag "None"))
:group 'rmail-headers
:version "29.1")