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Best email server solution for a large deployment with 1 million users?

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Join Date: Aug 2002
Posts: 24

Best email server solution for a large deployment with 1 million users?


I'm currently researching the best solution for a large email service. The solution must be unix/linux based. It must have clustering and mirroring. It must scale to basically unlimited users. It must have a good management system to add new servers for expansion, and also a good system to manage the users.

So far, it seems to me the best solution for what I'm looking for is:

I have also looked at:

Is there an open source product that has clustering and mirroring? Is there any other products I'm missing? Anybody have any experience with or any of the above I listed?

Any help is much appreciated.



Last edited by wyatt12; 06-28-2010 at 03:32 AM.

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Eternal Learner
Join Date: Jul 2007
Posts: 2,032
If you have required resources, you can build one using Postfix and other packages for the various requirements. The other packages include but are not limited to courier-imap, maildrop, clamav, etc.

Prashant T.

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Join Date: Oct 2002
Location: Vancouver, B.C.
Posts: 2,535
I'm not sure about the mirroring, but you can definitely do clustering with Cyrus Murder, and IMAP Aggregator.

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