---
title: Exchange Online – You can now flag external emails in Outlook - cubesys
description: To help increase awareness to end-users to pay more attention on emails they receive, you can now have external emails tag on Outlook Mobile and Outlook Web Access (OWA); this is not (yet?) available for Outlook client on Windows or Mac.Highlighting emails received from external sender will help you end-user…
---

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# [Exchange Online – You can now flag external emails in Outlook - cubesys](https://www.cubesys.com.au/blog/exchange-online-you-can-now-flag-external-emails-in-outlook)

 Written by [cubesys](https://www.cubesys.com.au/blog/author/cubesys) | Mar 21, 2021 1:00:00 PM

To help increase awareness to end-users to pay more attention on emails they receive, you can now have external emails tag on Outlook Mobile and Outlook Web Access (OWA); this is not (yet?) available for Outlook client on Windows or Mac.

Highlighting emails received from external sender will help you end-user to better identify potential spam or phishing emails which may have went through your mail hygiene solution.

This setting is **turned off** by default.

To enable and manage it, you need to use Exchange Online PowerShell module v2 ([https://www.powershellgallery.com/packages/ExchangeOnlineManagement/](https://www.powershellgallery.com/packages/ExchangeOnlineManagement/); latest version 2.0.4).

Once you have ExO PowerShell module v2 installed, connect to your tenant and use the below commands to configure the external emails tagging setting:

> Connect-ExchangeOnline
> 
> Set-ExternalInOutlook -Enabled $true

<https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-Feb-21-2025-04-06-42-3490-PM.png>

You can also configure specific domains or email address **to be excluded** from the external tagging using the –AllowList parameter; the value to pass is an array using **;** (semi column) as separator

> Set-ExternalInOutlook -AllowList @{Add=”email address – like user@domain.com”; Remove=”domain – like domain.net”}

You can use the below command to check the configuration of the feature

<https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-1-Feb-21-2025-04-06-36-3287-PM.png>

Then it may take up to 48 hours for your users.

Once fully applied, your end-user will then see a banner or a notification depending of the client used like shown below.

<https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-2-Feb-21-2025-04-06-54-4453-PM.png>  <https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-3-Feb-21-2025-04-06-38-3626-PM.png>

When opening the email in Outlook mobile, you don’t see the sender details until you hit the **external** flag which then shows the sender email address

<https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-4-Feb-21-2025-04-06-40-3700-PM.png>  <https://www.cubesys.com.au/hubfs/Imported_Blog_Media/image-5-Feb-21-2025-04-06-46-1024-PM.png>

[View full post](https://www.cubesys.com.au/blog/exchange-online-you-can-now-flag-external-emails-in-outlook)

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