Check whether the newsgroups mentioned in the Newsgroups and
Followup-To headers exist.
@item valid-newsgroups
-Check whether the @code{Newsgroups} and @code{Followup-To} headers
+Check whether the @code{Newsgroups} and @code{Followup-to} headers
are valid syntactically.
+@item shorten-followup-to
+Check whether to add a @code{Followup-to} header to shorten the number
+of groups to post to.
@end table
All these conditions are checked by default.