Qmail NMX (version 0.1.1)
Architecture Overview

Macro View

The picture below illustrates the macro process provided by Qmail NMX (also called QNCE - Qmail NMX Cluster Environment).

As you could see the user accounts (and its respective domains) were stored under the extern file system entity, that can be available to all servers either by a simple file system export operation (eg. NFS) or by a specific hardware solution (eg. disk array hardware).

Process View

The picture below illustrates how the message comes thru Qmail NMX. Note that only host #1 and #2 are used for simplification purpose.