ASB AntiSpam - Block spam using challenge/response authentication.

AtomSpam - Protect your Microsoft Outlook inbox from spam using a series of checks.

Bongosoft Anti Spam 2004 - Authenticate the sender of each incoming e-mail message.

ChoiceMail Free - Keep spam out of your in-box by receiving e-mail only from recognized or approved senders.

Chrysanth Mail Manager - Identify and filter spam on your mail server without having to download.

Cloudmark Exchange Edition - Protect your corporate e-mail accounts from spam.

Cloudmark SpamNet - Join the peer-to-peer junk mail filtering network to help the global fight against spam.

CoffeeCup Spam Blocker - Scan your e-mail accounts and remove spam right from the mail server.

Dewqs' Junk Mail Spittoon - Kill spam on your server and get the real e-mail to your inbox.

Dewqs' No More Spam - Protect your e-mail from spam.