How to send emails to multiple relay server based on sender's email address in postfix?

Solution Verified - Updated -

Issue

  • How to route mails based on sender or sender's domain?
  • How to send emails to multiple relay server based on sender's email address in postfix?
  • Send emails to relay server depending on sender in postfix?

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Postfix

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