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We are a medium sized company with 5,000 employees. Every day we send and receive about 10,000 e-mails.

We want to set up our own Linux mail server (Postfix+Cyrus). What is recommended hardware for such needs?

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Five thousand employees is hardly small. I have a few less users then that in my Exchange 2007 environment but do 30K messages/day, and we run between 3-4TB of space for mailboxes. We use multiple servers. – sysadmin1138 Jan 31 '11 at 20:59
Just an FYI, 5,000 employees is not small on any scale. – ErnieTheGeek Jan 31 '11 at 21:00
You want 5000 employees using POP3 and IMAP? Have you considered looking at enterprise systems (such as Exchange)? – pauska Feb 2 '11 at 13:37
Yeah, sounds ignorant to focus on email when both, exchange and lotus do provide a LOT more, including scheduling in an integrated platform. – TomTom Mar 14 '11 at 6:50

I'd recommend looking for VPS's, take a look at Logicworks they have infiniCloud services, with CentOS , Postfix+Cyrus... all you may need for your services.

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