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Zimbra provides open source email and calendar groupware software, Zimbra is a popular choice for Linux and Mac OS X email servers and supports SaaS deployment, appliances and virtualization platforms.

Postfix forum. Postfix is a mail server that attempts to be fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different.

LinuxQuestions.org offers a free Linux forum where Linux newbies can ask questions and Linux experts can offer advice. Topics include security, installation, networking and much more.

EXPERTCORE : Helping Engineering Community Through Sharing Information

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ClearFoundation is a developer community for ClearOS, a Linux Internet Network, Gateway and Server for small business and distributed networks.

- UNIX and Linux Forums - Learn UNIX, UNIX commands, Linux, Operating Systems, System Administration, Programming, Shell, Shell Scripts

GNT is a Hi-tech portal : computing, hardware, mobility, enterprise, multimedia, video game PC consoles, technical help, downloading, windows processes , tips, tricks, How-to for Windows Seven 7 Vista, XP, 2008 Server, 2003, 2000, NT, 95, 98, Linux, ...