eMail2Pop   
http://www.porkchup.com

eMail2Pop functions as a POP3 and SMTP mail interface and spam filtering solution for AOL® Mail and Google Gmail(tm) accounts. eMail2Pop converts AOL mail and Gmail into a standard mail format. This means that AOL and Gmail users can retrieve their email from their favorite email client (such as Microsoft Outlook, Eudora, Incredimail, Act, The Bat, etc). eMail2Pop also includes a powerful integrated spam filter. For AOL accounts, eMail2Pop is independent of the AOL software program and does not require AOL to be installed for most users. The eMail2Pop Wizard will walk first-time users through setting up their email program to manage AOL Mail and Gmail. The integrated spam filter is very customizable, using features such as whitelists and blacklists, online blacklist checking, and self-teaching Bayesian analysis. eMail2Pop is a third-party product, and is not endorsed, sponsered, or affiliated with America Online, Inc or Google, Inc.

MailEnable Professional   
http://www.mailenable.com

MailEnable Professional Edition 2.0 includes all features of MailEnable Standard Edition plus additional functionality such as Web Mail and Web Administration, anti-virus support, enhanced anti-spam features and IMAP4. Professional Edition provides the features and flexibility to make it the ideal mail hosting solution for small to medium sized organizations. Features include: Powerful Administration - Easy to administer via the Microsoft Management Console, MailEnable has Web Administration to allow easier management of users and settings. Professional Edition v2.0 incorporates .Net web administration; Improved Spam Protection Professional Edition contains numerous anti-spam features, with the addition of SPF and Bayesian filtering to protect your system from unwanted junk mail; Full Featured Web Mail - Additional features, HTML support, personal contacts, folders, custom ‘skins’, pop retrieval and multi-lingual support. Now supports the .Net framework; Enhanced Security - Extensive security measures and authentication methods including, APOP and SMTP authentication, protect your mail server from unauthorized access. Now includes and NTLM support for high-level password encryption; Message Filtering - Message filtering allows you to define rules and actions for messages as they pass through MailEnable. Create message filters globally to quarantine messages, move, copy, or delete messages based on several criteria such as content, sender, recipient, subject, or attachment type. The addition of scripted filtering allows for the creation of a powerful filtering engine within MailEnable.

BusinessMail Email Server + Anti Spam System   
http://www.netcplus.com

BusinessMail 4 is a powerful Intranet/Internet email server and anti-spam system designed specifically for the business environment. It can be installed on any W95/W98//ME/W2K/XP or NT4 PC, and does not require a dedicated PC for smaller installations. BusinessMail 4 offers single/multiple email domain support, a web mail interface, web based configuration, fully user configurable "score based' anti-spam system, user & domain aliasing, powerful routing/filtering, flexible connection scheduling, remote administration via simple emails, support for permanent connections such as ADSL, cable and others, and of course all types of dial-up connections, automatic SMTP mail collection (if you have a permanent Internet connection and an MX record) and also via POP3 from multiple pop3 mailboxes. BusinessMail 4 can even send mail directly to internet recipients without an SMTP relay (using MX records), making it perfect for DSL, RoadRunner and other permanent connection users that are hosting their own Internet domains. BusinessMail 4 provides support for user configurable ports to allow it to connect across your network via internal or external routers, cable modems, dial-up systems or T1/T3 connections. A 2 mailbox system is only $62, a complete 5 user BusinessMail 4 email server system is $322, and more mailboxes can be added for a small incremental cost.

Lockspam Pro   
http://www.polesoft.com

Lockspam Pro is safe anti spam filter software for Outlook, Outlook Express, Eudora, Incredimail, Mozilla, The Bat!, Pegasus, Foxmail and other POP3 mail clients. It safely kills the spam and protects your innocent mails. Lockspam adopts Polesoft unique patent-pending anti spam technology which laid multi-level protection to your Inbox. Spam are killed before reach your Inbox. We guarantee 100% satisfaction. Free to download and free to try. Besides it effecitvely saves your time, Lockspam benefits you as follows: 1. Work with most POP3 Mail Clients 2. Apply Advanced Filtering Rules 3. Support Multi-User Mode 4. Free and frequent updates for Anti Spam Engine, Security Packs, BBL and add-ins for Outlook and Outlook Express to fight against the latest epidemic spam. 5. Easy and handy, no more settings needed after installation. 6. Automatically Import Contact Lists 7. Works longer the better. 8. Attentive but free high-quality service. 9. Free to download, free to try.

POP3 preview LITE   
http://www.pool-magic.net

Check of messages on the POP3 server with ability to delete message from the server, without urgency to download it. Next, you can safely download attachments so it doesn't try to run any from them. It is possible to apply simple Spam filter.