The Sun Java System Messaging Server (formerly Sun ONE Messaging Server) is a high-performance, highly secure messaging platform one of the leaders in the service provider messaging market. Scaling from thousands to millions of users, the Java System Messaging Server is suitable for both service providers and enterprises interested in consolidating email servers and reducing total cost of ownership of communications infrastructure.

The Sun Messaging server also provides extensive security features that help ensure the integrity of communications through user authentication, session encryption, and the appropriate content filtering to help prevent spam and viruses.

The Sun Java System Messaging Server along with the Sun Java System Calendar Server and Sun Java System Instant Messaging offer their users a comprehensive communications and collaboration environment. The Sun Java System Messaging Server is also a key component of the Sun Infrastructure Solution for Enterprise Messaging Consolidation, enabling customers to offer rich collaborative services while dramatically reducing costs.

Key Features
* High performance and scalability
* Extensive security features
* Virtual domain hosting and delegated administration
* Scalable, robust and extensible messaging components
* Multiple client support

It has been ported to Unix, Linux & Windows Operating systems.

This mail-server from Qualcomm’s Eudora division works on WinNT server, Workstation 4.0 or higher or Windows 2000 & above Operating systems. Simple to Use and Manage Installs easily and requires very little administrator maintenance. Users can take advantage of web-based administration tools to manage their accounts, view account status, change passwords and create auto-reply and vacation messages - all without administrator intervention.

The WorldMail Management Center offers powerful server administration via its central and remote management facilities and easy-to-use interface.

Security The Eudora WorldMail Server features built-in security features including APOP and CRAM-MD5 authentication facilities to avoid sending passwords over the network, multi-level access control and Windows NT security services.

Robust Functionality Standards-based Internet messaging server seamlessly supports both Internet Messaging Access Protocol (IMAP4) and Post Office Protocol (POP3) clients for transparent migration and co-existence.

Native to Internet Open, standards-based client/server architecture , Eudora WorldMail Server easily integrates with off-the-shelf Internet-standards based applications and supports Internet-standards compliant email clients like Eudora Pro Email and Eudora Light.

Help Built-in online help facility and electronic documentation make operation of the server easy and convenient.

The Netscape Messaging Server quickly delivers email with embedded sound, graphics, video files, HTML forms, Java applets, and desktop applications. Netscape claims that the Messaging Server outperforms other messaging systems in the speed of message processing, handling of queues, and power of directory lookups. Organizations that use Messaging Server will find that they can communicate with virtually all mail systems and gateways.

Offering unparalleled power, felexibility, and security, the Messaging Server supports thousands of users per system. It offers remote connectivity with support for controlled downloads or slow modem connections, vacation notices and automatic replies, confirmation of delivered messages, and flexible security. You can improve your company’s productivity as well as your customers’ satisfaction by setting up automatic email responders for customer queries, automatically building mailing lists of contacts, and updating employees’ desktop software by sending executable applications over email.

Upgrade and expand easily, even from proprietary systems. Messaging Server can expand to handle information coming from proprietary systems and can convert existing information from legacy systems automatically, including existing attachments and personal address books. Because this server adheres to all the Internet standards for transferring information, it’s much easier to administer and maintain than traditional proprietary networks.

Lower cost of ownership through centralized user management. Messaging Server includes Netscape Directory Server and can access all other directories and address books. Messaging Server is a Lightweight Directory Access Protocol (LDAP) client that leverages a shared repository for user, group, and other directory-style data using the LDAP Internet directory protocol. This shared directory architecture gives Netscape SuiteSpot administrators a single place from which to manage users, groups, and other shared data.

The Internet Exchange Messaging Server (IEMS) is a highly modular and scalable open architecture messaging system. It can be used from small single machine installations to fully distributed systems linking geographically distributed sites into a common set of logical domains. Its various components can be run on a single machine or in a distributed environment. Administrators can install IEMS on Windows 98 and ME (Anti-Virus Detached Machine), NT, 2000, and XP. For Linux administrators, IEMS can be installed on RedHat Linux 6.2 through 9.0; Mandrake 8.2 through 9.1; SCO Linux Server 4.0 (United Linux 1.0); RedFlag, and Cosix (CS&S).

A technical introduction and specifications to IEMS can be found here. In additional all IEMS Documentation is freely downloadable.

Internet Exchange Messaging Server totally integrating spam detection, handling, and decision making across the entire messaging system - from connection controls through to the end user mail client. IEMS spam control measures include SMTP connection controls (site and Internet blacklisting), mail relay, MTA level content analysis, user mail sorting, and user directed Bayesian filtering. Site administrators are able to define site wide spam security policies, while deferring decisions on many of the spam detection methods to the end user, including SMTP connection controls.

This combination of SMTP controls, Content Filters, Bayesian Filters, DNS Blacklists, and the integrated extension of these controls to the end users allows for an extremely flexible protection system, designed to block the maximum number of problem messages with no collateral damage.

Some of the many features include anti-virus scanning, attachment filtering at the MTA level, distribution list manager, batch SMTP, connector modules to legacy mail environments such as Lotus cc:Mail and Notes, and more. Messages can be retrieved from the IEMS Message Store using any standard POP3 or IMAP4 capable client (Outlook Express, Eudora, Evolution, etc), as well as the customizable IEMS Web Mail Client. The Web Mail client also supports private and public address books as well as online file storage through web folders. IEMS also supports Outlook compatible calendaring and scheduling, allowing for a natural migration path from Microsoft Exchange.

IEMS is licensed in either Standard Enterprise Edition or Professional Enterprise Edition modes. Both editions are identical in terms of functionality with the exception that the Professional Enterprise includes cc:Mail and Lotus Notes connectors and also has the ability to operate across distributed systems.

IMA provides a free public test environment you can log into now to get an immediate feel for the power and flexibility of IEMS or you can download your own copy and test it on your server for free for 30 days.

WorkgroupMail is a full featured mail server, which can provide any size organization with secure and dependable messaging. To help combat increasing security threats to your email, WorkgroupMail offers comprehensive features to protect you from virus infected messages and senders of spam mail.

Its key features include :

* Virus protection - Server based virus protection using your existing anti-virus software.
* Spam filtering - Checks to see if the computer which sent a message is blacklisted on the major RBL lists. Quarantines or deletes any such messages.
* Content filtering - Add commercial and legal disclaimers. Check for unacceptable language.
* Attachment filtering - Part of the content filtering. Removes unwanted types of file attachment before they reach the end user.
* Public Folders - Encourage collaboration by sharing certain folders amongst the users.
* IMAP support - Store all message folders centrally, allowing side by side access from a mail client or WebMail.
* Web-based mail client - Provide users with web-based access to their email.
* Web-based administration - Remotely administer WorkgroupMail using a web browser.

Whether it is for a large enterprise, hosting its own email, or a smaller organization, collecting mail from one or more ISPs, the makers of WorkgroupMail mail web server claim that it can provide everything required to run a smooth and effective mail system.

WorkgroupMail is extremely easy to install and configure. A 30 day trail version is available on their website so you can try-n-buy.

A mail-server solution from down-under ! MailEnable is an Australian company whose Mail Server software provides a powerful, scalable hosted messaging platform for Microsoft Windows. The software is reliable, affordable and has many of the features of a professional high performance mail server without the complexity or cost.

The software is relatively easy to install and configure. With clear instructions and logical installation wizards, if you prefer a DIY approach, you can have your mail server up and running within minutes. There are three options available , the Standard edition which is downloadable for free to the full featured enterprise edition.

MailEnable Standard Edition - ideal for users who need the power and stability of a high performance mail server, but require only basic email services such as POP, SMTP, standard spam protection, list server and auto-responders.

MailEnable Professional Edition - For small to medium sized organizations. Professional Edition adds important functionality such as IMAP4, HTTPMail, 3rd party Anti-Virus support, enhanced anti-spam including SPF and global filtering, WebMail & powerful API, allowing you to easily modify, integrate and expand on mail services you provide.

MailEnable Enterprise Edition - Designed for large scale organizations (eg: ISP’s) Enterprise Edition includes clustering support, service selection per mailbox, Bayesian filtering, optimised services for speed and scalability and enhanced WebMail.