My organization uses Microsoft Outlook 365 (Microsoft Outlook web interface - OWA), and since recently I see some "External" tag for each email I receive that came from outside my organization

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1 Answer 1


According to a few Reddit users, the display of the "External" tag for each email that came from outside my organization is controlled by the organization's admins.

User fieroloki:

You don't. It's controlled by the admin

Some additional information by crw2k:

Your tenant admins have enabled this as it is a new optional feature. It can’t be bypassed like the old transport rule method that put the external warning in the email but could be hidden by spammers using css.

The new external tag is a tenant wide setting not per user and it only supports a maximum of 30 external sender domain names in the whitelist (less if long domain names)

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