ChoiceMail is a spam-blocking system based on the premise that all incoming email is assumed to be spam until senders have obtained permission to send you email. Until they do so, mail from unapproved senders will not appear in your email application. Unapproved senders are automatically offered the opportunity to register. If they do so you are notified so that you can choose to approve (or not) all future emails from that sender.
Windows 7, Windows 2003, Windows 2000, Windows Vista, Windows XP, Windows NT, Windows Server 2008