1)   SpamBlocker 2.3.42
Spam Blocker blocks unwanted messages on the mail server. Saves traffic and delivers from viewing annoying e-mail advertising. Spam Blocker works with several mailboxes and allows configuring user setting for blocking spam.

 2)   TNL Antispam 1.1.2582
TNL Antispam will check your POP3 Email box and weed through your incoming mail messages. There are several processes that TNL Antispam uses to eliminate spam from your inbox. Using a combination of filter and challenge & response technology.

 3)   spamPepper 5.09
100% spam blocking for POP accounts without using filters. Valid senders register through a secure protocol to allow their mail through.