Complete Mail Server   
http://www.softfolder.com

Complete Mail Server is high-performance professional SMTP/POP3 server software engineered for corporations and ISPs to satisfy business needs in ultra fast, flexible and reliable mail server. It works along with any email program or mailer and offers a lot of security features and options to allow you to protect the server from the outside and restrict the SPAM activity. In case of parallel mail processing, Complete Mail Server can be installed on several computers while the common message queue and user mailboxes can be kept on separate dedicated computers. You can assign specific configuration for each installation to facilitate email messaging in your organization. Friendly user interface of the program can be installed separately from the SMTP and POP3 services to give you ability to manage each of the server installations from a single PC. The SMTP and POP3 services can work as NT services and will keep working in the logoff mode. The special test mode is provided for software debugging and testing purposes that you can use to check if your email clients work properly. While test mode is activated, the server accepts your email messages, stores them in the queue but nothing delivers to the actual recipients. For example, this feature can be useful for developers to debug the scripts written with PHP, Perl, Java or other software. The SMTP Gateway Servers is another significant feature that makes Complete Mail Server just perfect for personal usage especially for the laptop PC users who have to change Internet Service Providers (ISP) while traveling around the world. Simply add all your SMTP servers that you use in different places to the unlimited list of gateway servers and the program will always find a correct SMTP server wherever you connect your PC to the Internet with any type of connection; so you do not have to modify SMTP settings of your email program each time you change ISPs.

TM-POP3 Server   
http://www.tmsoft.com

POP3 Server for Windows delivers e-mail fast and fully integrates with Microsoft SMTP server for Windows NT/2000/XP. Supports multiple user mailboxes, multiple domains, remote administration, logging, and security controls. Admin account supports remote configuration and e-mail auditing for monitoring or archiving all received mail. Includes security access controls to limit connections from only certain IP addresses. Runs as a Windows service which can be configured to run at system boot. Installation and configuration couldn't be easier with the automated installer and administration tool. The server and administration tool are designed to not require any additional system DLL's, which means the server will never conflict with other software! The TmPop3 server, TmPop3 Administration tool, and help documentation are included in the installation download. TM-POP3 Server is stable, fast, and efficient.

POP3 OCX   
http://www.vb4all.net

The POP3 OCX component is an advanced Active-X control which can be embedded into any Active-X compatible environment, and used to check pop3 servers for email. With the control you can enumerate the properties of received emails for validation or data retrieval. The component has a full series of properties and methods that can be used to interact with email.

Raven   
http://www.winserver.us

Raven is an Integrated ( everything designed to work together ) WEB, POP3, SMTP, FTP, LIST, NNTP, ECHO, and IDENT server that provides a superior combination of stability, security, and scalability. NOTE: Use of any server is optional. Included standard is support for TLS/SSL security connections. Also standard is support for AVG server level ( SMTP ) virus protection that secures all accounts from email born viruses. Also included is the best ANTI-SPAM system available.

POP3 Webmail ASP   
http://www.WebmailASP.net

Send and receive email from any computer on the web. Install webmail on your server or upload it to your ASP web-hosting account. Retrieve and read the messages from your POP3 server, including those in HTML format. Setup automatic deletion of db messages. Compose, reply, or forward new messages. Add signatures. Send, receive, open, or save attachment files; no upload component is required. Create you own folders. Contact book. Auto refresh inbox. For more, please see this page: http://www.webmailasp.net/pop3webmail.asp