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Large scale message handling infrastructure design

In this article, we will describe some of the most important things that need to be taken into account when designing a large scale messaging setup.

We are referring to large scale setups, not cluster setups; the main difference being that cluster setups involve a high-availability situation, which is not the case with large scale setups that achieve high availability or redundancy through other means than the mail server software or the way the setup is organized and performed.

Introduction
 
For large scale setups, we will need to use several mail servers since we need to separate some of the processes performed on a message before it is delivered to the intended recipient's mailbox. This is required because many large scale setups requirements exceed the capacity of the today's available hardware that can be used in a single machine design.

We will now describe all the operations performed on every required machine in the setup, along with the services that they need to run and their purpose.
 
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