gnus-safe-html-newsgroups

gnus-safe-html-newsgroups is a variable defined in `gnus-group.el'.
Its value is

"\\`nnrss[+:]"

Documentation:
Groups in which links in html articles are considered all safe.
The value may be a regexp matching those groups, a list of group names,
or nil. This overrides `mm-w3m-safe-url-regexp' (which see). This is
effective only when emacs-w3m renders html articles, i.e., in the case
`mm-text-html-renderer' is set to `w3m'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.2 of Emacs.