Variable: rmail-summary-font-lock-keywords
rmail-summary-font-lock-keywords is a variable defined in
rmailsum.el.gz.
Value
(("^ *[0-9]+D.*" . font-lock-string-face)
("^ *[0-9]+-.*" . font-lock-type-face)
("^ *[0-9]+[^D-] \\(......\\)" 1 font-lock-keyword-face)
("{ \\([^\n}]+\\) }" 1 font-lock-comment-face))
Documentation
Additional expressions to highlight in Rmail Summary mode.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/rmailsum.el.gz
(defvar rmail-summary-font-lock-keywords
'(("^ *[0-9]+D.*" . font-lock-string-face) ; Deleted.
("^ *[0-9]+-.*" . font-lock-type-face) ; Unread.
;; Neither of the below will be highlighted if either of the above are:
("^ *[0-9]+[^D-] \\(......\\)" 1 font-lock-keyword-face) ; Date.
("{ \\([^\n}]+\\) }" 1 font-lock-comment-face)) ; Labels.
"Additional expressions to highlight in Rmail Summary mode.")