How would you determine the receiver's spam reputation without scanning the email messages or the sender's reputation first? Receiver's spam reputation must be determined somehow before the next email message comes...
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determing initial receiver reputations
You don't have to scan the receiver's mail or use the sender's reputation. So the system can be bootstrapped without analyzing or rating any messages at all. All you do is assign an initial ham,spam count for active users that is higher than inactive users. The system then self-adjusts the statistics as mail flow comes in.
Using the above bootstrapping technique, with only 1M messages, we can achieve 99.69% catch rate with zero false positives which was measured on a 130,000 message test set.
It is quite amazing to see.
Totally content and language independent.
old news
3 or for years ago Chinese researchers experimented with sender reputation with great success and the 2pennyblue project had had simple reputation features since 2002. One signification advantage of reputation based systems is that the content filter can break and you hardly notice.
looking to the future, 2pennyblue is taking the Chinese researchers work one step further and using multiple reputation sources to control how messages are delivered. early results are very promising.
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