Office 365 - Force TLS

May 5, 2020

[ O365 ] [ O365, Security ]

In order to enforce TLS to secure e-mail connections in Office 365 to and from a particular domain, you can use connectors.

By default, Exchange uses opportunistic TLS. Follow the steps below to set up connectors:

1. Login to Microsoft 365 admin center, and navigate to the admin center for Exchange.
2. Click on “mail flow” in the left nav.
3. Click on connectors.

Set up the outbound connector

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Send a test e-mail to an address at the domain to validate the connector:

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Set up the inbound connector

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Review connectors

Jason Sears

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