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DisableTagging Flow for Office 365
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Updated:
8 January 2026
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Purpose

As you know, Microsoft provides the feature for Outlook to tag the external messages.

External tagging is an org-wide setting. You cannot deploy it to subset of users. DisableTagging sets the MAPI property 'IsExternalSender' to false. It means the External tag will not appear on ingoing messages of the given mailbox.

DisableTagging for Office 365 is a Power Automate flow.

Current version: 1.0.4

Installation

  1. Run Office 365 Power Automate and create the "Office 365 Outlook" connection.

    ReadAndMove flow - Office 365 Outlook connection

  2. Download DisableTaggingFlow104.zip file and then run Office 365 Power Automate and import the zip file to your flows list as described here.

    DisableTagging flow - import

  3. Select the "Inbox" folder in the Folder field of the trigger.

    DisableTagging flow - trigger settings

  4. Turn on the DisableTagging flow.

    Turning the flow on


Testing

(assuming you have already enabled tagging via Set-ExternalInOutlook commandlet)

  1. Send a test message from any external address to your internal address.

  2. Open Outlook and check if the message is NOT marked as external.




This application is freeware.

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