Phishing/fraud prevention, Sender verification support via SPF, spoof-proof whitelists...
New in v3.0.311.x: 'Report a bug' button added to menu (3.0.311.1); ability to set the number of days to save quarantined messages to less than 7 (3.0.310.0); fix for a bug that caused Approve and Block to fail on a small number of email addresses (3.0.311.2); small change made in the way some dates are displayed (3.0.311.3); various other minor bug fixes (3.0.311.4 - 3.0.311.7); Release Notes - Last Updated: 05.19.05 Upgrade Meter:2
New in v3.0.x: Phishing and fraud prevention features (authenticates the identities of email senders with support for SPF - Sender Policy Framework), Yahoo! DomainKeys, and other industry authentication standards; blocks fraudulent email; and stamps e-mail messages with authentication test results); improved quarantine review and automated blocking of repeat offenders; instant, integrated search (now searches all information in Outlook and Outlook Express to instantly find important e-mail messages, attachments, appointments, contacts, journal entries, and other information); improved automatic bug reporting (v3.0.306); fixed a few bugs that caused crashes in both Outlook and Outlook Express (v3.0.306.8 and v3.0.306.9); Release Notes - Last Updated: 03.16.05 Upgrade Meter:5
New in v2.1.213.4: Two fixes for bugs in very obscure Outlook and Outlook Express configurations; various other bug fixes; Release Notes - Last Updated: 10.27.04 Upgrade Meter:2
New in v2.1.213.2: Support for Swedish, Danish, and Dutch; now correctly filters spam in Outlook 2000/2002/XP in offline mode as well as Outlook 2003 in cached Exchange mode; resolved conflict with Norton AntiVirus 2004; various bug fixes; Release Notes Upgrade Meter:2
Pros: White list lets in only those you allow, solid integration with Outlook and Outlook Express
Cons: The user has to put in the time to compile the white list based on incoming messages, requires use of either Outlook or Outlook Express to run