I also found that 2.55 was a bit too permissive. After looking at how a few
of the mis-classified spams were scored, I tweaked the defaults a little and
added language/locale checking.  Here's my local.cf file:

ok_languages en ru fr it es de
ok_locales en ru fr it es de
# limit RBL checking to max. 5 secs instead of default of 30
rbl_timeout 5
score CLICK_BELOW 0.2
score DATE_IN_PAST_12_24 0.2
score FROM_ENDS_IN_NUMS 1.5
score FROM_NO_USER 1.0
score HTML_60_70 0.5
score HTML_80_90 0.5
score HTML_IMAGE_ONLY_02 2.5
score HTML_LINK_CLICK_HERE 0.2
score HTML_MESSAGE 0.1
score HTML_TAG_BALANCE_BODY 0.1
score HTML_WEB_BUGS  0.7
score HTTP_WITH_EMAIL_IN_URL 0.1
score MIME_HTML_ONLY 0.1
score OFFERS_ETC 0.9
score RAZOR2_CHECK 3.0
score RCVD_IN_NJABL 1.5
score RCVD_IN_OSIRUSOFT_COM 1.0
score REPLY_TO_EMPTY 0.6
score RISK_FREE 1.0
score SAVINGS 0.1

Mileage may vary. I haven't tried re-training SA, just tweaked the
weights until the false negative rate dropped to a sufficiently low
level. I haven't seen any blatant false positives (a newsletter here/there
that I needed to whitelist or filter out, but no "regular" mail).




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