Introduction

The idea was to create a highly scalable mail system (do not read as highly available). We wanted to have 2 POP Proxy servers to route the connections to backend mail store servers, 2 web mail servers, and 2 SMTP servers. Each of these pairs would be behind a load balancer. In addition any of the six servers would be able to take over any of the jobs in case of an emergency.

These are the features that we needed to support:

• POP Access
• Web Mail
• Authenticate against a Microsoft® Active Directory Server (this was already in place)
• Multiple (Virtual) domains
• IMAP Access
• Virus Protection
• Spam Filter
• Free

Note: What I'm going to describe in this document is not for the faint of heart. This is a very complex email system. Ours is currently using twelve servers.

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© 2002 Henry Beatty     Last Modified:

Disclaimer: I will not be held responsible for any problems encountered by following these instructions. This is informational only. Do not use this on a production system. Use at your own risk.