How to configure a relay host in Postfix

Solution Verified - Updated -

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?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Postfix

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