Securing External Meeting Requests for Microsoft Teams Rooms

So, I thought I’d record a video overview on how to set this up. See below.

In the example below, I simply say which recipient this rule applies to (optional) and then say the message must originate from outside the organisation. Then I can say that the message header must include calendaring (even more locked down). I also have a bounce back message if someone fails the check (see further down). Finally, I say which domain(s) can bypass this rule. In my case, it’s my own domain can send external invites to my test tenant.

If someone fails the Mail Rules, they then receive this error message when they try and invite from external.

So, there we have it, a way to limit the exposure of external senders to your meeting room devices/calendars by Securing External Meeting Requests for Microsoft Teams Rooms.

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