A default sendmail.cf file will be installed in /etc.
The default configuration should work for most SMTP-only sites.
It will not work for UUCP sites; you will need to generate
a new sendmail.cf if you need to use UUCP mail transfers.
To generate a new sendmail.cf, you will need to install m4
and the sendmail source package. Read the README file in
the sendmail sources for more details on creating sendmail
configuration files. Also, O'Reilly & Associates publishes a good
sendmail reference entitled sendmail by Bryan Costales.
One common sendmail configuration is to have a single machine act as
a mail gateway for all the machines on your network. For instance,
at Red Hat Software we have a machine mail.redhat.com that does all
our mail. On that machine we simply need to add the names of machines
for which mail.redhat.com will handle mail to /etc/sendmail.cw.
Here is an example:
Then on the other machines, torgo, poodle, and
devel, we need to edit
With this type of configuration, all mail sent will appear as if it were
sent from redhat.com, and any mail sent to torgo.redhat.com
or the other hosts will be delivered to mail.redhat.com.
Please be aware that if you configure your system to masquerade as
another any email sent from your system to your system will be sent to the
machine you are masquerading as. For example, in the above illustration,
log files that are periodically sent to [email protected] by
the cron daemon would be sent to [email protected].
# sendmail.cw - include all aliases for your machine
# here.
torgo.redhat.com
poodle.redhat.com
devel.redhat.com
/etc/sendmail.cf to ``masquerade''
as mail.redhat.com when sending mail, and to forward any local
mail processing to redhat.com. Find the DH and DM
lines in
/etc/sendmail.cf and edit them thusly:
# who I send unqualified names to
# (null means deliver locally)
DRmail.redhat.com
# who gets all local email traffic
DHmail.redhat.com
# who I masquerade as (null for no masquerading)
DMredhat.com