In the spam that has deliberate bayes-busters (three lines of random words), the
X-Mailer header is totally bogus, like this

X-Mailer: cyan exiting space

header XMAILERBOGUS             X-Mailer =~ /^[^A-Z0-9]*$/
describe XMAILERBOGUS           X-Mailer header has NO uppercase letters, NO 
numbers... How do you expect me to believe that
score XMAILERBOGUS              0.5

I *think* this would work but I'm not going to implement it without running this
by the list - my regexp skills aren't top-notch.


-- 
/* Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
 * way.
 */
        2.4.3 linux/net/core/netfilter.c


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