Function: nnmail-cache-id-exists-p
nnmail-cache-id-exists-p is a byte-compiled function defined in
nnmail.el.gz.
Signature
(nnmail-cache-id-exists-p ID)
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/nnmail.el.gz
(defun nnmail-cache-id-exists-p (id)
(when nnmail-treat-duplicates
(with-current-buffer nnmail-cache-buffer
(goto-char (point-max))
(search-backward id nil t))))