The RED and BLUE tags seem moderately useful in conjunction with big font
checks.
I don't know why blue text is so popular, all I can guess is it is the color
of certain little pills. The other color cases could probably disappear
with no great loss.
The COLOR_UNSAFE rule would be very useful if it worked better. It seems to
catch a lot of the fffffe and fefefe type colors on a white background, but
it misses a lot fo them also, such as when the color value is 2 lines after
the keyword.
Image area is I think useless. I can't remember ever seeing a hit on one of
these rules in current spam.
Image_only and occasionally image-ratio tags show up and can help classify
spam.
Loren
