I recommend allowing mistake-based training of the small number of false negatives (I use procmail for this as described at <http://www.dankohn.com/archives/000323.htm>).
that link does not load.
--
<Athene> we all have our moments when we lose it
<Slyspy> the key is though, to conceal the evidence before the police arrive
smime.p7s
Description: S/MIME cryptographic signature