[Exim] W32/Sircam worm

Like many sites we're seeing loads of W32/Sircam worms:

    http://www.sophos.co.uk/virusinfo/analyses/w32sircama.html

Moreover, one of the various suffixes it uses seems to be ".lnk"
which the current system_filter doesn't seem to deal with.

Chris

--
Chris Edwards                   University of Glasgow Computing Service,
C.Edwards@???    Glasgow, Scotland. Phone: +44 141 330 4892.