Provide a short explanation that says why the email is blocked.
In the Do the following section, select Block the message > reject the message and include an explanation.
You can, for example, add a selected user group so that only its members won’t be allowed to send emails outside the organization. To do so, click More options at the bottom of the window, and then click the add condition button (the button shows up once you have enabled more options).
If you don’t want the rule to apply to all users, you can add another condition that narrows down its scope.
In the new rule window, under the Apply this rule if section, select The recipient is located > Outside the organization.
Then, in the Exchange admin center, click mail flow and then rules.
In the Admin centers section, click Exchange.
Log in to your Office 365 portal, then go to the Microsoft 365 admin center by clicking the Admin app.
To restrict all (or specific) users to sending only internal emails and block their emails when they’re sent to external recipients, follow the steps below: Novemin ExchangeOnline, Office 365, Outlook No Comments 1508
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