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This tool acts as an SMTP proxy server and filters all your email traffic before it reaches the actual server. Includes adaptive Bayes recognition, an SPF scan, your own honeypot and RBL (Real-time Blackhole List) check. Can be set up as a service under Windows. Its integrated web server also enables you to configure the server and perform logfile diagnostics via a browser.

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This tool links BlackBerry smartphones with the Microsoft Exchange and IBM Lotus Domino servers installed in your company. Extended version with support for Novell Groupwise requires a licence.

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Multi-protocol mail and groupware server that supports ESMTP, SMTP, IMAP and POP3. Includes a compact web front end with a basic calendar. Fast and secure download from The H

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Service Pack 2 for Exchange Server. Co-operates with Microsoft Office 365 and seals individual mailboxes to protect evidence in the case of legal disputes.

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SMTP server program for Windows which delivers emails directly to the recipient’s email server. An advanced version is available for $49.

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SyncML server that provides an email push service, data synchronisation and administration functions for mobile devices. Client plug-ins available for Palms, BlackBerrys or iPods. Also available as complete server bundles for Windows and Linux with all the important components.

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Multilingual email server which supports virtual domains, routing, mirroring, scripting and the IMAP, SMTP and POP3 protocols. Includes a COM library for integration into other programs such as spam and virus protection, and an SQL database.

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HTTP proxy, FTP proxy, SOCKS4/5 proxy, SMTP/IMAP server for in-house emails and for querying external email accounts.

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Freeware mail server with POP3 (server and collection service), SMTP server, IMAP server, webmail server and anti-spam mechanism (blacklist).

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Rule-based anti-spam and anti-virus server with up-to-date recognition functions such as SpamAssassin, SPF, grey listing, receiver verification, and OCR; extended versions available.

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Email server for Windows and Netware environments. The older 4.01c version, which has also undergone further development, is still available.

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Simple HTTP(S), HTTP reverse and IMAP and POP3 proxy sWeb server that supports HTTP(S), IMAP and POP3; can be used with websocket support as a reverse proxy; provides a gunzip-module; compressed web pages can be unpacked before being delivered to the browser.

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Used to exchange messages, appointments, contacts and documents. Supports cooperative working in teams or departments. Client available for a range of Linux, Windows and Mac OS versions. Includes an optimised web front end (compatible with HTML, WAP, HDML and WML) for mobile access. Download requires registration.

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Linux-based groupware server for email, calendar and messaging functions. Includes an interface to Outlook and also supports email for BlackBerry and Palm Treo devices. Can also be purchased as an Enterprise edition, for which support is provided.

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Software which integrates into the system tray and sends a notification as soon as a new email or RSS feed is received.

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For testing the SMTP and DNS-MX configuration of mail servers. Software is in English, despite the German-only web site.

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Use this tool to set up a link to an SMTP server so you can send commands to it. Primarily designed to enable system administrators to detect errors, such as if an email client can’t establish a connection. If required, it can also save all the commands that were sent so they can be run again. Requires no installation.

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Effective spam filter for a server. Analyses mail headers and content using a Bayesian filter, DNS blacklists and a filter database.

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A combination of virus scanner and firewall, which protects against viruses, hackers, spyware and phishing. Blocks spam and monitors wireless networks. Downloading the demo version requires registration.

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