Red Hat ENTERPRISE LINUX 4 System Administration Manual page 360

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Chapter 38. Mail Transport Agent (MTA) Configuration

Figure 38.1. Mail Transport Agent Switcher

If you select OK to change the MTA, the selected mail daemon is enabled to start at boot time, and

the unselected mail daemons are disabled so that they do not start at boot time. The selected mail

daemon is started, and any other mail daemon is stopped; thus making the changes take place

immediately.

For more information about email protocols and MTAs, refer to the Reference Guide.