Architecture
The Postfix core consists of several dozen daemon programs that run in the background, each handling one specific aspect of email delivery. Examples are the SMTP server, the scheduler, the address rewriter, and the local delivery daemon. For damage-control purposes, most daemon programs run with fixed reduced privileges, and terminate voluntarily after processing a limited number of requests. Only a small number of Postfix daemons interact with users through two small "gate" programs for mail submission and for queue status information.
Read more about this topic: Postfix (software)
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