How to configure a relay host in Postfix

Solution Verified - Updated 2024-02-21T15:35:53+00:00 -

Issue

Postfix needs to be configured on a local machine to use an existing SMTP relay on a network. Or,
Postfix needs to be configured on a local machine which is on an intranet where the internal DNS uses no MX records.
How to configure a Postfix relay host?
How to configure a relay host or relay gateway in postfix?
How can a Postfix relay host be configured?
How can Postfix relay mail to a relay mail server?
How to configure Postfix as a relay client?

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