Please just killfile the thread until it dies. Spammers usually do not
go back and read the replies to their posts in dozens of newsgroups.  It
does no good to post a complaint within the group.

By replying to a spam in public, you inadvertantly become a spammer
yourself by cross-posting your reply to all of the groups the spammer
originally posted to. Complaining to the poster's internet service
provider is recommended.

If you feel you must answer, please answer by email instead of publicly,
so that your flamage only afflicts the one that crossposted it.