Which of the following is NOT a daemon in Postfix?

Which of the following is NOT a daemon in Postfix?

• qmgr
• master
•  crond
• smtpd 

 

EXPLANATION

The crond daemon is a Linux daemon, not a Postfix daemon.
The master daemon is the brain of the Postfix mail system. It spawns all other daemons. The smtpd daemon (server) handles incoming connections. The qmgr daemon is the heart of the Postfix mail system. It processes and controls all messages in the mail queues.