Installing and Administering Internet Services

Chapter 4 159
Installing and Administering sendmail
Installing sendmail
The sendmail installation script performs the configuration changes
that are described in “Installing sendmail on a Standalone System” on
page 157. To set the system up as an NFS server and allow the
sendmail clients to read and write to the /var/mail directory, do the
following:
1. Make sure all mail users have accounts on the mail server and that
their user IDs and group IDs on the mail server are the same as on
the client machines. (This step is not necessary if you are using NIS
or NIS+ and your mail server is in the same NIS or NIS+ domain as
the clients.)
2. In the /etc/rc.config.d/nfsconf file, use a text editor to set the
NFS_SERVER variable to 1.
3. Use a text editor to add the following line to the /etc/exports file:
/var/mail -access= client , client ...
where each mail client is listed in the access list. If the /etc/exports
file does not exist, you will have to create it.
4. Issue the following command to run the NFS startup script:
/sbin/init.d/nfs.server start
For more information on NFS, see Installing and Administering NFS
Services.
Installing sendmail on a Mail Client
sendmail clients do not receive mail on their local system; instead, users
on the client systems obtain their mail on the mail server. User mail
directories reside on the server, and users read their mail over an NFS
link. By default, a sendmail client forwards to the server any local mail
(a user address destined for the client system) and sends non-local mail
directly to the destination system or MX host. Outgoing mail appears to
originate from the server, so replies are sent to the server. For more
information on how sendmail clients and servers work, see “Default
Client-Server Operation” on page 178. sendmail clients can be diskless
systems.
To configure a sendmail client system to access a sendmail server:
1. In the /etc/rc.config.d/mailservs file, use a text editor to set the
SENDMAIL_SERVER variable to 0. This ensures that the sendmail
daemon will not be started when you reboot your system or run the