Postfix : How to accept mails based on Office 365 Tenant ID
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
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.