System Administration Guide: Network Services

Overview of the Hardware Components

A mail configuration requires three elements, which you can combine on the same system or provide in separate systems.

If users are to communicate with networks outside your domain, you must also add a fourth element, a mail gateway.

Figure 12–1 shows a typical electronic mail configuration, using the three basic mail elements plus a mail gateway.

Figure 12–1 Typical Electronic Mail Configuration

Diagram shows the dependencies between a mail gateway,
a mail host, mail servers, mailboxes, clients.

Each element is described in detail in Hardware Components.