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?

Vinod Survase 4,781

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

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Answer 1

Yuki Sun-MSFT 41,376 Moderator

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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Vinod Survase 4,781 Reputation points

2023-08-14T09:07:32.12+00:00

Thanks Yuki Sun-MSFT

I will check and update here.
Yuki Sun-MSFT 41,376 Reputation points Moderator

2023-08-16T01:26:44.09+00:00

Hi @Vinod Survase ，

I made this change in my lab tenant the other day and can verify that it's now working in both OWA and the Outlook client on my end:

Feel free to give it a shot at your convenience. By the way, if you find any of the replies helpful, please don’t forget to click "Accept Answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.
Vinod Survase 4,781 Reputation points

2023-08-16T08:05:35.73+00:00

Thanks Yuki Sun-MSFT

Yes I also did run it and it worked for me as well. Thanks for sharing these cmdlets.

Answer 2

Manu Philip 20,206 MVP Volunteer Moderator

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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--please don't forget to upvote and Accept as answer if the reply is helpful--

Vinod Survase 4,781 Reputation points

2023-08-14T09:06:01.3133333+00:00

Manu Philip Thanks for answer on this.
Manu Philip 20,206 Reputation points MVP Volunteer Moderator

2023-08-14T13:52:11.6133333+00:00

If the answer helped, please click 'Accept as answer' so that it can help others in the community looking for help on similar topics.
Vinod Survase 4,781 Reputation points

2023-08-16T08:07:41.9166667+00:00

Manu Philip Thanks for reply. I did test it but did get expected results so may be something was wrong or not configured correctly. I did try via PowerShell and it worked.
Bachar Bader 86 Reputation points

2024-03-19T19:24:42.9933333+00:00

I didn't find the action of: Notify the sender with a Policy Tip in mail flow rule.

Answer 3

Arjen van den Berg 0

I didn't find the action of: Notify the sender with a Policy Tip in mail flow rule.

Same.

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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?

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