KnockKnock 

Anti Spam program eliminates unsolicited e-mails in your inbox. KnockKnock is a complete e-mail enhancement program and spam solution, and works with your current Email client. Easy features handles, multiple e-mail accounts on multiple servers.
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Internet Drummer! 

This program allows you to preview e-mails on multiple POP3 servers and delete unwanted messages before using e-mail client. It includes automatic spam filtering and serves as a notifier for both new e-mail arrivals and changes on specified web pages
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