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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...

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Hi John, If funding permits, you might want to look into a cloud-based anti-spam solution to direct your outbound mail through. This way if an account is compromised your email servers are never blacklisted. The vendor will give you a warning regarding the offending account. However you should put some checks into place, as Harry stated below, in order to stop the compromised account before getting a warning. We use Postini, but there are several other good options out there such as ProofPoint and EdgeWave. Thanks, Michael -- Michael Kenney Information Security Officer IT Department University of the Sciences 600 S. 43rd St. Philadelphia, PA 19104 215-596-7403 Office m.kenney@usciences.edu | www.usciences.edu USciences:  Where healthcare and science converge
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