Postfix : How to accept mails based on Office 365 Tenant ID

Solution Verified - Updated -

Issue

  • How to configure postfix SMTP server to accept mails only with Office 0365 Tenant ID specified and reject all other mails.
  • The SMTP relay must only relay emails with a proper X-MS-Exchange-CrossTenant-Id: header and drop or reject anything else.

Environment

  • Red Hat Enterprise Linux 7

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