How to notify the users that they are adding/sending an email to an external recipient/receiver for Outlook & OWA from admin GUI or any PowerShell or MS Graph?

Question

How to notify the users that they are adding/sending an email to an external recipient/receiver for Outlook & OWA from admin GUI or any PowerShell or MS Graph?

Note: I would want to enable this as admin for whole tenant and manage it.

Answer 1

Hi @Vinod Survase ,

How to notify the users that they are adding/sending an email to an external recipient/receiver for Outlook & OWA from admin GUI or any PowerShell or MS Graph?

Aside from the method shared by Manu, You can also connect to Exchange Online Powershell and then run the command below to turn on the External Recipients MailTip:
Note: It may take some time for the change to take effect.

Set-OrganizationConfig -MailTipsExternalRecipientsTipsEnabled $true

Reference:

• Set-OrganizationConfig
• Enabling the External Recipient Mailtip in Office 365
  Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

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Answer 2

You may use the following mail flow rule to send a notification to the sender, if they send an email to an external recipient by any of method

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