1. SPAM WeeSan Lee weesan@cs.ucr.eduweesan@cs.ucr.edu

2. Roadmap What is SPAM? Why Spamming? How to avoid SPAM? References

3. What is SPAM? Spiced ham or luncheon meat? http://media.hormel.com/images/refimages/museum%20press%20kit/spam%20hero%20web%20ready.jpg Unsolicited Emails.

4. Why Spamming? Cheap  Senders cost almost nothing Effective  0.001% of 1 million = 10 respondents A very tough battle for end users!

5. How to avoid SPAM? Use a SPAM blocker or anti-spam software Spam tagging  Unsolicited Commercial Email (UCE) X-Junkmail: UCE  SpamAssassin X-Spam-Flag: YES SMTP Authentication  Need to provide username and password before sending emails Stop publishing your email address online

6. How to reduce false positive? False positive  Good emails get classified as SPAM UCR webmail  Set UCE score a little higher (HW4) Other webmails  Add known addresses to address book

7. References Internet Effectively  Ch 1  Ch 4 The Apache SpamAssassin Project  http://spamassassin.apache.org/ http://spamassassin.apache.org/ UCR SMTP Authentication  http://www.cnc.ucr.edu/antispam/index2.php?content=auth entication/index.html http://www.cnc.ucr.edu/antispam/index2.php?content=auth entication/index.html UCR Anti-Spam  http://www.cnc.ucr.edu/antispam/ http://www.cnc.ucr.edu/antispam/