POP3D for unix and mac - Free Servers from Eudora

Netscape Mail and Messaging ServerEudora WorldMail ServerSIMS - Sun Internet Mail Server - For Solaris.

3R Soft, Inc. - MailStudio @Message, web-based messaging solution. News, support pages with forum, download.

Exim - Message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence.

UW IMAP software - IMAP4rev1 server and a POP server with the ability to relay commands to an IMAP server.

smail - ftp site

JMail - Free Java(tm) E-Mail Server

QPopper - free unix pop3d

IntraStore Server 98 - commercial messaging server from CDC

Bluetail Mail Robustifier - Bluetail provides software to ISPs for making high-availability fault-tolerant mail handling systems. Supported protocols are SMTP, POP3 and IMAP4.

Advox Omnigate Messaging Server - All you need in one package! Advox Omnigate is a software package that combines an e-mail gateway and messaging server. It seamlessly connects all major LAN-based e-mail programs and provides e-mail access to the Internet, Pagers, GSM-Phones and Fax.

Consensys MailNet - smtp,pop3 for win32

MDaemon - Full-featured Email server that can support all your LAN and Internet Email needs from one POP3 account. Adds POP3, SMTP, and mailing list services, account control and more, all on your network.

Internet Anywhere Mail Server - POP3/SMTP server, apparently for Wintendos

Disappearing Inc. - Developer of disappearing email, an email policy system with a powerful new approach to protecting messages and controlling corporate email.

NEXOR - mission critical messaging - NEXOR provides organizations with reliable and sophisticated methods for managing and securing their electronic communications.

ArGoSoft Mail Server - Fully functional STMP/POP3/Finger server. Freeware and shareware versions available. Takes up only 1 Mb of disk space and lets you turn your computer into an e-mail system. [Win95/98/NT/2000]

iTECH - Email Services for Schools and School Districts. Cntralized maintenance, building level administration, spam filtering, web mail access.

Mailgate - Mail Server and Proxy Gateway server MailGate, and POPWeasel - POP3 collection for SMTP only Mail Servers

Internet Mail Server (IMS) from the European Microsoft Windows NT Academic Center (EMWAC) - Suite of server programs which allow you to use Windows NT as a mail server for Internet mail. [WinNT/2000]

MIO Mail Server from Mobico (Mobile Internet Company) - Large scale mail server with rich functionality: Calendar, Addres Books, Groups, teamware, SyncML synchronization.

VPOP3 for Windows - Is an Internet Email server and gateway for small, and medium sized businesses. [Win95/98/Me/NT/2000]

inFusion Mail Server - The only mail server that uses ColdFusion, iHTML or Active State Perl to control every aspect of mail delivery. [Win95/98/NT/2000]

SLmail Email Server - Easy to set up, easy to manage mail server [Win NT4/2000].

NTMail - Internet Mail Server with Web Configuration, proxies, dialup, SMTP/ESMTP/POP3/IMAP4. [Linux, Solaris, WinNT/2000]

CUCIPOP - Cubic Circle's unix pop3d source code - ftp site

Deliver - a program for reliable and flexible local mail delivery. It's a perfect adjunct to your mail transport of choice (such as Sendmail or qmail).

Cyrus IMAP Server - An Open Source, sealed IMAP server developed at Carnegie Mellon University.

Eserv - Mail, news, Web, FTP and proxy tools. Product details and forum. [Windows]

IMail - SMTP/POP3/IMAP4/LDAP mail server for Windows NT with web interface for messaging and administration, plus List Server capabilities.

Software.com - Offers; Post.Office, a commercial Internet e-mail server. Available for both UNIX and NT.

SmartServer - Low cost, powerful email servers for business intranets. For Win32

InterMail - A scalable family of mail servers designed for commercial service providers.

SQLMail Server - SQLMail Server allows you to access ODBC data sources through simple email messages. You can now host your database server anywhere you want while provide database services on the web. The server automatically processes email requests and sends response back.

Domino Mail Server - From IBM/Lotus Notes

POSTFIX browserable and searchable archive - Searchable archive of the POSTFIX MTA mailing list

Ipswitch IMail Server - Quick to install and easy to administer, a flexible, web-accessible, standards-based and spam-resistant mail server. [WinNT/2000]

PostMaster - Intelligent e-mail messaging system, whose primary purpose is to provide multiple individual e-mail accounts over a single Internet account.

Sugarsoft Mail Server - Standard Internet SMTP and POP3 Mail Server for Windows 95, 98 and NT. Unlimited domains and mailboxes. Features dial-up, mail lists, auto reply, anti spamming and runs as NT service. Uses clean ASCII files.

Mail Essentials - mail gateway for Exchange and SMTP servers for anti virus, content checking and more. Includes free anti spam tool and smtp/pop3 server

Mirapoint Internet Message Server, Message Router and Message Switch - Mirapoint products are designed to manage the explosive demand for Internet messaging.

Datadeal Technologies - RelayFax fax/e-mail gateway, MDaemon e-mail solution. Free trial downloads, support pages. [Windows]

EzMTS.org - Free download, FAQ, mailing list, documentation and source code for this tool. [Windows]

W2K Mail Server - Trial downloads, news, articles and reviews for Windows NT and 2000 products.

Kinesphere Corporation - Developers of Internet (SMTP/POP3/UUCP) gateways for Microsoft Mail (MSMail), Workgroups (Windows Messaging), Exchange, cc:Mail, Notes, GroupWise

Wingra Technologies - provides enterprise messaging coexistence and migration software and services.

Mail essentials for Exchange/SMTP - Email security & e-mail management software for content checking/filtering, anti virus, e-mail tracking, usage reports, attachment compression and more.

CommuniGate Pro - from Stalker Software. High-end Internet mail server. [over 20 platforms]

iMate - iMate has webserver, mailserver, web wail Engine, and contains WYSWYG HTML editor. The GUI is similar to Microsoft Outlook, and then you can use this easily. Shareware.

Mailtraq - Comprehensive e-mail SMTP/POP3 and proxy server, with a powerful mailing list server and intuitive WebMail service. Includes dialup manager, user accounting and content barring.

MailSite - SMTP, POP3, LDAP3, IMAP4 standards-based Internet E-mail and List Server. [WinNT/2000]

Lotus cc:Mail - Offers customers platform-independent e-mail solutions. Supports a number of cc:Mail LAN and Mobile clients as well as IMAP, POP3 and LDAP connections.

Rockliffe Systems - IMAP4, SMTP, POP3, LDAP3 standards based internet mail and list server for Windows NT and 2000.

Mail Studio - Provides web based e-mail server solution for Linux or Unix.Easy usage and convenience enables users to have accesses to their e-mail anytime, anywhere if they only have an access to a web browser, login ID, and password.

1st Class Internet Solutions - Free solution with unlimited domains, mailboxes and mailing lists, graphical administration tool. Product details, knowledge base.

Courier-IMAP Server - Courier-IMAP provides IMAP access to Maildir mailboxes.

netMailshar - Easy to use smtp/pop3 mail server with auto-dialer, advanced scheduler, autoresponder, message viewer, email forwarding and more.

Infinite InterChange - Server-based application that integrates seamlessly with any IMAP4, POP3, SMTP, Microsoft Mail, Microsoft Exchange, Lotus cc:Mail, Lotus Notes, or Connect2 based e-mail system, or a mixed environment containing multiple protocols. [Win95/98/NT/2000]

Cloud Nine - Provider of internet email server solutions, with a range consisting of SLMail, Mailtraq, Post.Office, FTGate and WinRoute as well as add-ons such as Emurl and WebEdge.

ITHouse Mail Server - Commercial e-mail server for small business and home networks. Unlimited POP3 accounts. Unlimited domains. [Win95/98/NT/2000]

PostCast Server - Enables you to send e-mail directly from your computer, without your Internet Service Provider's server.

FuseMail - POP3/SMTP Mail Server for Windows, specifically designed for home and small office use. Powerful filtering facilities, is equally suitable for Internet and local mail.

Sessionwall - Electronically scan email content, log and then provide the authorized administrator with a view of the email content.

MERAK Mail Server - Mail server for Windows 2000/NT/9X supporting SMTP/POP3/IMAP4, lists, server gateways, web mail, wap mail, etc.

Mercury Mail Server - A free, rock-solid, fully RFC-compliant, mail server, for Intel platforms. Includes POP3, SMTP, IMAP modules, advanced filtering, advanced mailing-list hosting. [Netware, Win95/98/NT/2000]

Mercur Mail Server - Mail server, business messaging and mailing lists. Atrium Software International, Inc. [Win 95/95/NT/2000]

NTmailserver.com - Information and free trials for NT Mail, IMail. Also GLCommunicator mailing list tool. [WinNT4/2000]

Delano Technology Corporation: Customer Velocity - Automated e-mail applications and management solutions. Portable Document Format (PDF) documentation and FAQ available.

NetCruiser Software - NetCruiser Mail, with ESMTP, POP3, and relay facilities. Shareware download, FAQ, support pages, screenshots. [Windows]

WZI Consulting: Custom Mail Delivery Solutions - To deliver all mail for a domain usually requires a fixed IP address, an MX record, and an SMTP server. Here there are some other solutions discussed, including Fetchmail, BSMTP batched mail, and a UUCP transport.

UW IMAP Server Maildir Patch - Fixes for UW-IMAP2000c sources by Dave Harris.

Teapop - Open source POP3 solution. Free download, documentation, FAQ. [Unix source/RPM]

Privatemail.com, Inc. - Application Service Provider (ASP) messaging system with Web, wireless and POP access. Demonstration, support request form, technology overview.

Internet Exchange Messaging Server - Standalone, open architecture Internet mail server desgined to co-exist with proprietary messaging systems. Free trial version, support pages, forum, mailing list. [Linux, Win98/NT/2000]

WorkgroupMail - Free trial version, FAQ, complete documentation, and reseller list. [Windows]

XMail - Free download, full documentation, mailing list, forum. [Linux, Solaris, Windows NT]

Lectramail - SMTP, POP, Web mail. Free trial version, manual, forum, and a tutorial. [Windows]

MailSentinel - Server-based e-mail security authentification systems. Free trial version, support pages.

Microsys Technologies, Inc.: Desktop Server 2000 - Direct marketing product avoids use of external server.

eContact eMail - Intelligent eMail routing and automated response capabilities. Using rules-based eMail management technology, eContact eMail analyzes incoming messages and composes personalized answers that are either automatically dispatched or queued for agent consideration.