Sun™ ONE Messaging Server: Practices and Techniques for Enterprise Customers

Simple Single-Layer Architecture

In the simplest form, sometimes referred to as messaging in a box, all the components of the messaging server run on a single system (FIGURE 3-1) and no proxy is involved.

Figure 3-1. Messaging Server, Storage, and Firewall Messaging System

The components are:

• Directory

• MTA

• Mailstore

The benefits and drawbacks to this type of architecture are:

• Simple

• Easy to manage

• Easy to troubleshoot

• Low total cost of ownership (TCO)

• Limited scalability— This architecture is obviously limited in scalability to the computer system's size (CPU and memory) and operating system's scalability. Do not let this fool you into thinking that ...