If you see this happen, don't just post about it in the newsgroup, but
instead email a complete copy of the headers of the spam to
ab...@mozilla.org so that the sysadmins can cancel it.
They don't have the time to monitor all the newsgroups, and sometimes
something does slip through giganews' spam filters, so notifying them in
that way is the swiftest way of the spam being taken care of.
(No need to do it for this particular spam message, I've already done so.)
Sander