SpamScreener is a challenge/response anti-spam system that shields your Inbox from spam and other unsolicited email by requesting a confirmation reply from every unapproved sender. The sender only has to confirm an email once, and can be automatically added to a list of approved senders. SpamScreener can also use your existing address list and approve all email that comes from one of your contacts, so that existing contacts do not even have to go through the approval process at all. The software checks the mail in your POP account whenever you run your email program, or automatically every X minutes. You can review a list of pending approvals, preview the messages, and also manually approve any sender. If the unknown sender did not respond to the challenge email, the message can be automatically deleted. SpamScreener is easy-to-use requires very little configuration.

The license of this software is Free Trial Software, the price is $29.99, you can free download and get a free trial.