214
Chapter 15. Email
For example, if you want all email addressed to any
domain.com
account to be delivered to
<
bob@otherdomain.com
>, you need to add a line similar to the one below to the
virtusertable
file:
@domain.com
bob@otherdomain.com
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
containing the new configuration.
15.3.4. Common Sendmail Configuration Changes
Although a default
sendmail.cf
file is installed in
/etc/mail/
during the Red Hat Linux installa 
tion process, you will need to alter it to use some of the program's more advanced features.
When altering the Sendmail configuration file, it is best generate a entirely new
/etc/mail/sendmail.cf
file instead of editing an existing one.
Caution
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/mail/sendmail.cf
command. After creating a new
/etc/mail/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 and is part of the
sendmail cf
pack 
age.
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/mail/sendmail.cf by running:
m4 /etc/mail/sendmail.mc
/etc/mail/sendmail.cf
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/mail/sendmail.cf
files are configured.
15.3.4.1. 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 handles all their email and assigns a consistant return address to all out
going mail.






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