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Re:How Mailinator compresses its email stream by 90% by newman314 on Tuesday February 21, 2012 @01:47PM (#3617564)
Reading about another algo (Locality Sensitive Hashing) as referenced in the first comment.

http://www.stanford.edu/class/cs345a/slides/05-LSH.pdf

Re:How Mailinator compresses its email stream by 90% by pjscott on Tuesday February 21, 2012 @07:44PM (#3618714)
See also this library for locality sensitive hashing:

http://lshkit.sourceforge.net/