UC Irvine’s New Anti-Spam Measures - PowerPoint PPT Presentation

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UC Irvine’s New Anti-Spam Measures

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  1. UC Irvine’sNew Anti-Spam Measures • Keith Chong • Network & Support Programming • Network & Academic Computing Services • UC Irvine • August 9, 2005

  2. New Anti-Spam Measures • Realtime Block List (RBL) from Spamhaus.org: • Spamhaus Block List (SBL): List of spam sources and spam services. • Exploits Block List (XBL): List of computers with proxies, viruses, and trojans installed. • “Greeting delay” blocks connections from non-conforming mailers that send data too early. • Greylisting temporarily rejects new senders. Compliant servers will return. Spammers are not likely to return. • Unknown users blocked earlier in transaction. • Rate limiting: 60 messages per minute and 10 concurrent connections on a per server basis.

  3. UC Irvine’s E-mail System

  4. Effectiveness of Anti-Spam Measures 418,771 208,353 Accepted 143,817 190,446 Spam 131,674 Accepted 11,307 Spam 19,972 Viruses 836 Viruses

  5. Connections Blocked

  6. New Preventive Measure Blocked Connections Spamhaus RBL 186,240 Greeting Delay 11,898 Unknown Users 9,426 Too Many Open Connections 6,115 Rate Limit Exceeded 10,793 Connections Blocked Statistics for 7/29/2005

  7. Questions & Answers