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I am running unix CentOS 5 and looking for free mail server that has GUI web interface for managing accounts. It be used with windows based clients on outlook express.

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The Zimbra communication suite is apparently pretty popular - I've been investigating it for use at my company, and it pretty much meets all the standard Outlook/Exchange work-alike requirements.

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Maybe have a look at Proxmox Mail Gateway:

They have a Free license which appears to restrict to one domain.

Lots of people, including myself, use their free Proxmox VE (Virtualization Environment) product which provides a similar looking GUI web interface. If the quality of that product is any indication, it is probably worth your while to check out the Mail Gateway.

Their datasheet includes a table that shows what the Free version does not include.


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