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Email blacklists blocking campus mail servers
Hotmail, Yahoo, and AOL are particularly good about returning 4xx errors very early in a spam run. Watch for those and respond accordingly. More generally, http://www.slideshare.net/rcgraves/sans-phishorlando SlideShare doesn't seem to show speaker notes. For references see: https://www.sans.org/reading_room/whitepapers/email/phishing-detecton-re...