Mail UnKnown Anti-Spam - Mail UnKnown Anti Spam does not use spam filters to guess what's spam and what's not. It uses a Verify then Validate method giving you full control of the e-mails you receive. All incoming e-mails are put on hold until the sender of the e-mail is first verified. After they are, you have the option to validate them as an e-mail sender you want to receive e-mails from. Mail UnKnown is compatible with virtually any e-mail program or service that uses the standard POP3 for receiving e-mail. Mail UnKnown is not a replacement for your current e-mail client, it works with your existing e-mail. Version 2.0.1.90 supports Windows XP user switching.