when downloading newsgroup headers from news servers which haven't yet
universally (*) purged retained articles containing "googlegroups.com"
in their path/message-id headers, googlegroups.com articles may appear
in the downloaded header list unless your newsreader client is already
set to filter them out (reference headers may include googlegroups.com
so be sure to filter those as well); also, when responding to articles
in threads which may contain googlegroups.com in the reference headers,
simply delete the googlegroups.com article reference from such replies
and snip all or most of the quoted text attributed to googlegroups.com