Variable: gnus-suppress-duplicates
gnus-suppress-duplicates is a customizable variable defined in
gnus.el.gz.
Value
nil
Documentation
If non-nil, Gnus will mark duplicate copies of the same article as read.
Probably introduced at or before Emacs version 20.1.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/gnus.el.gz
(defcustom gnus-suppress-duplicates nil
"If non-nil, Gnus will mark duplicate copies of the same article as read."
:group 'gnus-meta
:type 'boolean)