Flag all emails from external senders in Outlook / Office 365

Add an External tag to all messages from outside senders in Exchange Online with the Set-ExternalInOutlook PowerShell one-liner, shown across Outlook clients.

This is a super quick one. To apply an External tag to all emails from external senders in Exchange Online, simply execute the following one-liner in PowerShell

Set-ExternalInOutlook -Enabled $true

The External tag then shows up in Outlook - Windows, Mac and on the web.

Comments