From: Lars Ingebrigtsen Date: Fri, 18 May 2018 14:05:02 +0000 (+0200) Subject: (gnus-blocked-images): Clarify privacy implications X-Git-Tag: emacs-26.1~29 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=152a556;p=emacs.git (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. (cherry picked from commit f4d9fd3dd45f767eca33fbf1beee40da790fa74e) --- diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el index 79b2ade62b2..15e88a34227 100644 --- a/lisp/gnus/gnus-art.el +++ b/lisp/gnus/gnus-art.el @@ -1635,6 +1635,16 @@ 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."