Gattaca Server   
http://www.gattaca-server.com

Gattaca Server - solution for the organization internal or external e-post service for the central or regional office. Gattaca Server full featured, 100 % compatible to existing standards POP3 and SMTP mail server. You can use it not only as an internal server, but also as a server for reception or sendings e-mails to others mail servers in the Internet or to main mail server in your organization. The Gattaca Server's license does not contain restriction by quantity of users. After purchasing license for Gattaca Server you can register any quantity of users which is necessary. With growth of needs in your organization you will not need to get additional licenses for new users. Gattaca Server use DNSBL, SPF, white and black list for protecting user's mail boxes from SPAM. During work Gattaca Server automatically update white list, by additing e-mail addresses which is sending e-mails. Also all incomming correspondence checking in DNSBL, black and white list, performing checking infringements SPF policy. Subject for such email will start with phrase [AntiSPAM]. It will allow you to filter such letters using mail agent filters and not lose important e-mails. Gattaca Mail Server working as service under control of operational system Microsoft Windows NT/2000/XP/2003. Gattaca Mail Server start with computer start, and can work on a computer without necessity of presence of the user.

Entry LE   
http://www.sparkleware.com

Test the security and robustness of your servers, via remote brute-force attack. - Compatible with HTTP, FTP, and POP3 servers - Internal word generator with character set selection - Supports all major wordlist formats - Coordinates attacks across multiple machines - Supports HTTP proxy servers - Track attack history in easy-to-read logs - Automatic save and filtering functions

Secur-e-mail for Windows   
http://www.acmetoolz.com

Secur-e-mail will encrypt the communication between your e-mail client (e.g. Outlook) and the POP3 server using an SSH connection. No server-side installation is needed. The software runs on a Windows system tray. It will enable a local POP3 server on your computer, which will allow you to setup your e-mail client to pick up e-mail locally. Other users (hackers) cannot read your username / password across the LAN or the Internet. Suggested for users that pick up their e-mail very frequently (e.g. every 15 minutes or less). Otherwise, their mail, login and password is being exposed to any users on the LAN or across the Net every n minutes (n being the interval of e-mail retrieval). Shareware version can be unlocked with a product key. Updated versions can be unlocked with the same product key (lifetime updates for free).

MailBee POP3   
http://www.afterlogic.com

MailBee POP3 is a powerful and easy to use COM object which enables ASP and Windows applications to receive, parse and delete mail from POP3 servers. Secure authentication, HTML mails, smart and fast MIME parser, email safety, and much more. Can be used in conjunction with SSL, SMIME, SMTP and MessageCensor components. Royalty-free distribution.

MailBee.NET Objects   
http://www.afterlogic.com

MailBee.NET Objects is a set of powerful and robust .NET components for composing, sending, accessing and parsing mail on SMTP, POP3, and IMAP4 servers. Written in 100% managed C# code, MailBee.NET Objects can be used in desktop, console, and ASP.NET applications developed in C#/VB.NET/etc. The key features of the components: quick methods for sending and receiving mail with a single line of code; POP3, IMAP4, and SMTP PIPELINING; secure TLS/SSL connections; accurate and flexible MIME parser; MS-TNEF (winmail.dat) attachments support; compose/view/preprocess HTML mails with embedded pictures; HTML-to-PlainText conversion and vice versa; mail merge, ESMTP, send without SMTP server, send a web page, send to IIS SMTP queue, Delivery Status Notifications; secure and user-defined authentication (including NTLM and POP-before-SMTP); Windows Integrated Authentication (authenticate using the current Windows user credentials); TO/CC/BCC, international charsets, custom headers, custom message formats (such as meeting request items); multiple attachments, file and memory attachments, access to every MIME part; XML, streams, backup SMTP and DNS servers, multi-threading, asynchronous methods; a lot of unique features like moving messages between folders in IMAP; rich set of events and error handling features, memory and file logging, and much more; documentation is available in CHM, VS.NET 2003, and VS.NET 2005 formats; royalty-free distribution.