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206 Chapter 16. Email

Figure 16-1. virtusertable example

Then, to add this new information to the virtusertable.db ﬁle, execute makemap hash

/etc/mail/virtusertable

/etc/mail/virtusertable as root. This will create a new

virtusertable.db that contains the new conﬁguration.

16.3.4. Common Sendmail Conﬁguration Changes

Although a default sendmail.cf ﬁle is installed in /etc/ during the Red Hat Linux installation

process, you will need to alter it to utilize some of the program’s more advanced features.

When altering the Sendmail conﬁguration ﬁle, it is best generate a entirely new /etc/sendmail.cf

ﬁle instead of editing an existing one.

Important

Before changing the sendmail.cf ﬁle, it is a good idea to backup the default version.

To add the desired functionality Sendmail edit the /etc/mail/sendmail.mc ﬁle. When you

are ﬁnished, use the m4 macro processor to generate a new sendmail.cf by executing the

m4 /etc/mail/sendmail.mc /etc/sendmail.cf command. After creating a new

/etc/sendmail.cf, you must restart Sendmail to make it take effect. The easiest way to do this is

to type the /sbin/service sendmail restart command as root.

By default, the m4 macro processor is installed with Sendmail. The m4 macro processor is included

with the sendmail-cf package.

Important

The default sendmail.cf does not allow sendmail to accept network connections from any host

other than the local computer. If you want to conﬁgure sendmail as a server for other clients, please

edit /etc/mail/sendmail.mc and change DAEMON_OPTIONS to also listen on network devices or

comment out this option all together. Then regenerate /etc/sendmail.cf by running:

This conﬁguration should work for most SMTP-only sites. It will not work for UUCP (UNIX to UNIX

Copy) sites; you will need to generate a new sendmail.cf if you must use UUCP mail transfers.

You should consult the /usr/share/sendmail-cf/README ﬁle before you edit any of the ﬁles

in the directories under the /usr/share/sendmail-cf directory, as they can affect how future

/etc/sendmail.cf ﬁles are conﬁgured.

16.3.4.1. Masquerading

One common Sendmail conﬁguration is to have a single machine act as a mail gateway for all

the machines on the network. For instance, a company may want to have a machine called

mail.bigcorp.com that does all their mail. On that machine, add the names of machines for which

mail.bigcorp.com will handle mail to /etc/mail/local-host-names. Here is an example:

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 206