[Pan-users] Filtering out the flood at sci.crypt

[JCA]

    For the last few weeks some idiot has taken to flooding sci.crypt
(and possibly other groups) with junk. The postings are spoofed to
appear as coming from regulars in the group, and the contents of the
postings are just random drivel.

   Anybody know a rule, or set of rules, to filter them out? It would
appear that the bogus postings all come from a specific news provider
- things like

  news.highwinds-media.com!hw-filter.lga!newsfe04.lga.POSTED!53ab2750

but I don't know how to filter this out.