Aldo's SPAM Cleaner 

Aldo's SPAM Cleaner is a tool that will save you bandwidth and time deleting automatically all the SPAM, Worms, Virus, Junk emails, Unwanted emails, email attacks and almost anything you define before download them from your POP3 account.
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OstroSoft SMTP Component 

COM library for sending emails from Visual Basic 6 and other COM-compliant programming and scripting languages. Supports multiple recipients, email (MIME) attachments, AUTH and POP3 authentication, HTML email, custom headers.
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PEN - Pennock's Email Notifier 

PEN is an easy to use, easy to setup Email Notifier that sits in your SysTray and pops up a small window and/or play a sound when new mail arrives. It supports POP3 (SSL) as well as AOL, Excite, Gmail, Hotmail, Netscape, Lycos, Mail.com, MSN &Yahoo.
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Inox 

Mail connector designed for transfering messages from any POP3 compatible server to MS Exchange or other SMTP compilant server.
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MailEnable Standard 

MailEnable Standard provides robust SMTP and POP3 services for Windows NT/2000/XP/2003 systems. Simple installation procedure and powerful administration tools means that you will be up and running quickly. FREE for personal and commercial use.
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Cactus Spam Filter 

Cactus Spam Filter is a free spam blocker. It protects your inbox by learning to detect spam as it's being used. This spam stopper integrates with all e-mail clients that use POP3 such as MS Outlook, MS Outlook Express, Netscape, Opera and Mozilla.
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