1. Spam Wrangling on UC Berkeley's CalMail

3. Spam detection CalMail uses Sophos PureMessage, running on CommuniGate Pro's front-end servers PureMessage assigns a spam "probability" to each message

4. Spam tagging Messages are tagged with custom x- headers identifying their spam "probabilities" Highly probable spam messages are also tagged with a subject line prefix: Subject: [SPAM:XXXXXXXXII] make money Client email programs can filter on these tags

5. Server-side filtering Via a Web interface, CalMail users can enable and configure filtering: –Minimum probability level –Retention period Filtered messages go into a standard IMAP folder, "spam", where users can view and manage them

7. Headers for deleted spam Headers for messages automatically deleted from the spam folder within the last 30 days are saved Users can view these headers, and contact senders if necessary

9. New spam handling defaults On October 1, 2004, CalMail's defaults will change. All messages with 70%+ spam probability will be: –Filtered to the "spam" folder; and –Automatically deleted after 30 days Users can change these settings via a Web interface Users who have previously configured these settings will not be affected