On Wed, 14 May 2014, James B. Byrne wrote:

Is there any way to limit Bayes content checking to only the first X
characters of the message body?  I ask this because it is clear that the spam
messages getting through contain text meant to poison the tests but this
gibberish always trails the main message and is separated by a large white
space in most cases.

You don't need to worry about it. There is strong empirical evidence that "Bayes poisoning" does not work if your Bayes is well-trained with what you actually do consider ham.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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