On Sun, 31 Aug 2014, Eric Shubert wrote:

I've seen an uptick of spam lately with random low contrast (hidden) text. This appears to be lowering bayes probabilities.

Learn them as spam. That will tend to eliminate that effect.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
 jhar...@impsec.org    FALaholic #11174     pgpk -a jhar...@impsec.org
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 822 days since the first successful private support mission to ISS (SpaceX)

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