From f4d9fd3dd45f767eca33fbf1beee40da790fa74e Mon Sep 17 00:00:00 2001 From: Lars Ingebrigtsen Date: Fri, 18 May 2018 16:05:02 +0200 Subject: [PATCH] (gnus-blocked-images): Clarify privacy implications * lisp/gnus/gnus-art.el (gnus-blocked-images): Clarify the privacy implication of altering the value of this variable. --- lisp/gnus/gnus-art.el | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el index 869ff4e661f..f6120dc5c7d 100644 --- a/lisp/gnus/gnus-art.el +++ b/lisp/gnus/gnus-art.el @@ -1616,6 +1616,16 @@ It is a string, such as \"PGP\". If nil, ask user." (defcustom gnus-blocked-images 'gnus-block-private-groups "Images that have URLs matching this regexp will be blocked. +Note that the main reason external images are included in HTML +emails (these days) is to allow tracking whether you've read the +email message or not. If you allow loading images in HTML +emails, you give up privacy. + +The default value of this variable blocks loading external +resources when reading email groups (and therefore stops +tracking), but allows loading external resources when reading +from NNTP newsgroups and the like. + This can also be a function to be evaluated. If so, it will be called with the group name as the parameter, and should return a regexp." -- 2.39.5