What is Postfix? It is Wietse Venema’s mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support Postfix. Postfix attempts to be fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different.
guides
Microsoft Exchange 2010 Deployment Guide
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Quick start guide - hardware & virtual
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Administration manual
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