Qurb - Block 100% of spam with Qurb 2.0 for Microsoft Outlook and Outlook Express. Qurb integrates with Outlook and Outlook Express, automatically filtering spam messages into a quarantine folder for later review. Qurb makes you more productive by preventing spam from interrupting your work. New mail notification is triggered only by legitimate e-mail messages, not by spam. With Qurb, you won't need to manually update address lists, rules, or black lists or teach your computer how to filter spam. Your list of approved senders is automatically updated as you work with your e-mail. Qurb also implements an optional challenge/response system: when enabled, senders of quarantined messages are automatically sent an e-mail confirmation request; when they reply to the request their original mail is moved from your quarantine to your Inbox automatically.