* lisp/gnus/mm-decode.el (mm-html-blocked-images):
Default to "" that blocks all external images.
* doc/misc/emacs-mime.texi (Display Customization):
Mention that mm-html-blocked-images defaults to "".
Customization}) is @code{shr}. In Gnus, this is overridden by the value
of @code{gnus-blocked-images} or the return value of the function that
@code{gnus-blocked-images} is set to (@pxref{HTML, ,HTML, gnus, Gnus
-manual}). The default is @code{nil}.
+manual}). The default is @code{""} that blocks all external images.
@item mm-w3m-safe-url-regexp
@vindex mm-w3m-safe-url-regexp
:type 'boolean
:group 'mime-display)
-(defcustom mm-html-blocked-images nil
+(defcustom mm-html-blocked-images ""
"Regexp matching image URLs to be blocked, or nil meaning not to block.
Note that cid images that are embedded in a message won't be blocked."
:version "25.1"