Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 - CUSTOMIZATION GUIDE Guide d'installation télécharger pdf (Page 155)

Chapter 16.

Mail Transport Agent (MTA) Conﬁguration

A Mail Transport Agent (MTA) is essential for sending email from a Red Hat Linux system.

The Mail User Agent (MUA) such as Mozilla Mail, Mutt, Pine, and Evolution is used to read

and compose email. When a user sends an email from an MUA, the messages is handed off

to the MTA, which sends the message to a series of MTAs until it reaches its destination.

Even if a user does not plan to send email from the system, some automated tasks or system

programs might use the /bin/mail command to send email containing log messages to the

root user of the local system.

Red Hat Linux 7.3 provides two MTAs: Sendmail and Postﬁx. If both are installed, sendmail

is the default MTA. Red Hat Mail Transport Agent Switcher allows a user to select either

sendmail or postfix as the default MTA for the system.

To start Red Hat Mail Transport Agent Switcher, use one of the following methods:

• On the GNOME desktop, go to the Main Menu Button (on the Panel) => Programs =>

System => Red Hat Mail Transport Agent Switcher.

• On the KDE desktop, go to the Main Menu Button (on the Panel) System => Red Hat

Mail Transport Agent Switcher.

• Type the command redhat-switchmail at a shell prompt (for example, in an XTerm or

GNOME terminal).

The program automatically detect if the X Window System is running. If it is running, the

program starts in graphical mode as shown in Figure 16-1. If X is not detected, it starts in

text-mode. To force Red Hat Mail Transport Agent Switch to run in text-mode, use the

command redhat-switchmail-nox.

Figure 16-1. Red Hat Mail Transport Agent Switcher

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 - CUSTOMIZATION GUIDE Guide d'installation Page 155