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Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 263 To stop Sendmail daemon to run on your neighbor or local server, client machines, edit or create the “/etc/sysconfig/sendmail” file and change/add the lines that read: DAEMON=yes To read: DAEMON=no And: QUEUE=1h NOTE: The “QUEUE=1h” under “/etc/sysconfig/sendmail” file cause Sendmail to process the queue once every 1 hour. We leave that line in place because Sendmail still needs to process the queue periodically in case the Mail Hub is down. Step 3 Local machines never use aliases, access, or other maps database. Since all maps file database are located and used on the Central Mail Hub Server for all local machines we may have on the network, we can safety remove the following command and man pages from all our local machines. /usr/bin/newaliases  /usr/man/man1/newaliases.1  /usr/man/man5/aliases.5  · To remove the following files from your system, use the command: [root@client /]# rm -f /usr/bin/newaliases [root@client /]# rm -f /usr/man/man1/newaliases.1 [root@client /]# rm -f /usr/man/man5/aliases.5 Configuration of the “/etc/sysconfig/sendmail” file for all type of configuration The “/etc/sysconfig/sendmail” file is used to specify SENDMAIL configuration information like if sendmail must run as a daemon and listen for mail or not, how must time to wait before sending a warning if messages in queue directory has not been delivered. Create the sendmail file (touch /etc/sysconfig/sendmail) and add in this file: DAEMON=yes QUEUE=1h The “DAEMON=yes” option instruct Sendmail to run as a daemon. This line is useful when Sendmail client machines are configured to not accept mail directly from outside, forward all local mail to a Central Hub, and don’t run as a daemon for better security. If you are configured your server or client machines in this way, all you have to do is to replace the “DAEMON=yes” to “DAEMON=no”. Mail is usually placed into the queue because it could not be transmitted immediately. The “QUEUE=1h” set the time interval before sends a warning to the sender, if the messages has not been delivered. Configuration of the “/etc/rc.d/init.d/sendmail” script file for all type of configuration Configure your “/etc/rc.d/init.d/sendmail” script file to start and stop Sendmail daemon Server. Create the sendmail script file (touch /etc/rc.d/init.d/sendmail) and add: