Filter breakers

[Stephen Davies]

I have been using bogofilter (currently 1.1.5) with Amavis and milter for a 
number of years now with great success.
Every day, several hundred spams are successfully detected and zero hams get 
filtered.
However, recently I have been having quite a number of spams getting through 
to my inbox.
They all seem to be very small messages in three or four categories but 
despite my rerunning each case with bogofilter -Ns at least four times, they 
keep on getting through.

The only change I have made to my configuration recently is to start 
registering hams. Previously, I only registered spams.

My database is some 200Mb.

Any ideas as to what is happening here?

TIA,
Stephen Davies
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