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Compliance: Always mark emails from guests as “External” in Outlook

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Since Ignite at the beginning of March 2021 it is now possible to tag external email. I will explain how this works in this post:

Outlook – mark External with “External” Tag

This has the advantage that it is very good for compliance. Users receive the label External in mobile, OWA and Outlook (latest version) and see that the email comes from External. This can then eliminate the need for the additional “External” header per message policy.  Studies showing that tagging within an email does not have the effect it should. Users do not see and recognize that the email was sent from an external party, thus preventing a phishing attack.


  • Exchange Online
  • not available for Exchange OnPremises
  • Exchange PS Module V2
  • Tenant the function must already be available, otherwise an error of the PS script occurs.

Powershell Script

######External marking#####

#Activate PS Scripting on your PC 
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

#ExchangeModule V2 install and import

Import-Module ExchangeOnlineManagement
Install-Module ExchangeOnlineManagement
Update-Module ExchangeOnlineManagement

Get-Module -ListAvailable

#Connect with Exchange Online
Connect-ExchangeOnline -UserPrincipalName emailadresse

#status contol


#Activate the External Tag

Set-ExternalInOutlook -Enabled $true
#activate only for a few
Set-ExternalInOutlook -AllowList admin@fabrikam.com,admin@fourthcoffee.com


source: Microsoft Ignite 2021 content


Get-ExternalInOutlook (ExchangePowerShell) | Microsoft Docs

Set-ExternalInOutlook (ExchangePowerShell) | Microsoft Docs


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