gnus-parse-headers-hook ¶Hook run before parsing any headers.
gnus-alter-header-function ¶If non-nil, this function will be called to allow alteration of
article header structures. The function is called with one parameter,
the article header vector, which it may alter in any way. For instance,
if you have a mail-to-news gateway which alters the Message-IDs
in systematic ways (by adding prefixes and such), you can use this
variable to un-scramble the Message-IDs so that they are more
meaningful. Here’s one example:
(setq gnus-alter-header-function 'my-alter-message-id)
(defun my-alter-message-id (header)
(let ((id (mail-header-id header)))
(when (string-match
"\\(<[^<>@]*\\)\\.?cygnus\\..*@\\([^<>@]*>\\)" id)
(mail-header-set-id
(concat (match-string 1 id) "@" (match-string 2 id))
header))))