Rated the highest by PC magazine, Qurb is designed mainly for Outlook and Outlook Express. It is easy to use and understand. By making a new and improved whitelist (contact list) allowing only those specified emails through, Qurb will only allow emails from the approved senders.
Qurb can also catch fraud attack spam emails, which automatically verifies the authenticity of messages from people and companies using industry standard digital signatures.
Any email that is not approved is sent to a quarantine folder to be reviewed. This way you won't miss out on any important emails from new senders. It has optional Challenge/Response which allows Qurb to confirm that senders of quarantined messages are real people and not automated spam robots.
The cost for a home version of Qurb 2.0 is $29.99.