By default, IRIX automatically starts sendmail at station start-up by using the shell script /etc/init.d/mail. However, if you are configuring and testing sendmail and don't want to reboot the station, you can run the /etc/init.d/mail script manually. You should always use the mail script to stop and start sendmail. It processes and checks sendmail related files and programs and in the correct order.
Start the sendmail daemon:
If you need to stop sendmail, enter the following command:/etc/init.d/mail start
/etc/init.d/mail stop