Spam Wrangling on UC Berkeley's CalMail
Spam detection CalMail uses Sophos PureMessage, running on CommuniGate Pro's front-end servers PureMessage assigns a spam "probability" to each message
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 programs can filter on these tags
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
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
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