Enhancing Email Address Privacy on Anti-SPAM by Dou Wang and Ying Chen School of Computer Science University of Windsor October 2007 Contents Introduction Related Works Our Proposed Method Advantages Conclusion Introduction SPAM Consume recipients’ time and work
Dou Wang and Ying Chen
School of Computer Science
University of Windsor
Completely Automatic Public Turing Test to tell Computer and Humans Apart (CAPTCHA) 
User interface of SOPHOS spam filter about quarantine and whitelist and blacklist.
Ttriggered by the recipient MTA to send a verification string back to sender to verify the sender is a real human.
Samples of CAPTCHA string
Hide the unique character in the email address, the symbol @
email@example.com at domain dot com
<img src="/imgs/emailaddress/username.gif" />
Diagram of encoding email addresses