Bayes duplicate message detection algorithm?

[David B Funk]

What algorithm does Bayes use to detect that it has already 'seen' a given message?

only recipients, Message-ID, Date, and a few Received headers are different)
if I feed all of them to Bayes, it will learn only about 10% of them, the
other 90% will be ignored as 'already seen'.

So how does Bayes decide that it has 'already seen' a given message when
it actually hasn't (it has already seen one that is -almost- identical).

--
Dave Funk                                  University of Iowa
<dbfunk (at) engineering.uiowa.edu>        College of Engineering
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#include <std_disclaimer.h>
Better is not better, 'standard' is better. B{

When I receive a bolus (say 40~60) of 'phish' messages from a compromised Hotmail/gmail/yahoo account which are mostly the same (body, many headers same,

smime.p7s
Description: S/MIME Cryptographic Signature