gnus-parameters

gnus-parameters is a variable defined in `gnus.el'.
Its value is

nil

Documentation:
Alist of group parameters.

For example:
(("mail\\..*" (gnus-show-threads nil)
(gnus-use-scoring nil)
(gnus-summary-line-format
"%U%R%z%I%(%[%d:%ub%-23,23f%]%) %s\n")
(gcc-self . t)
(display . all))
("mail\\.me" (gnus-use-scoring t))
("list\\..*" (total-expire . t)
(broken-reply-to . t)))

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.