EXTERNAL This email Grant Instruments.

Question

How to fix [EXTERNAL] This email originated outside of Grant Instruments.

Answer 1

Hi @Noah Armstrong 

The banner [EXTERNAL] This email originated outside of Grant Instruments is not an error message. It’s a security feature in Microsoft 365 / Exchange Online designed to alert users when a message comes from outside the organization.  

End users cannot remove or disable this label. If emails from internal or trusted domains are being tagged incorrectly, an Exchange administrator must review the organization’s mail flow rules or external email tagging configuration and make any necessary adjustments centrally, such as adding domain exceptions or modifying the policy. 

I hope this helps clarify the behavior. 

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Answer 2

The text [EXTERNAL] This email originated outside of Grant Instruments is a security label added to emails that come from outside the organization. It is working as designed to warn users that the message did not originate from within the company and may carry higher phishing risk.

Key points:

• The [External] label is configured and controlled by the email administrator in Exchange Online/Microsoft 365.
• It does not mean the message is spam or junk; it is only a warning banner/tag.
• For recipients inside the organization who see internal mail incorrectly marked as external, the email administrator must adjust the configuration so messages from trusted internal domains are not tagged as external.
• For messages that truly come from outside the organization, the label is expected behavior and cannot be removed by the sender; only the organization’s admin can change or disable the feature.

To change or remove this behavior, the Grant Instruments email/Exchange administrator must:

1. Review the external tagging/labeling configuration in Microsoft 365/Exchange Online.
2. Ensure the organization’s own domains are treated as internal so internal mail is not tagged as external.
3. Optionally disable or modify the external label feature if the organization decides it is not needed, understanding this reduces a phishing protection signal for users.

End users in Outlook or Outlook on the web cannot permanently “fix” or turn off this label themselves; it must be changed centrally by the admin.

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References:

• Troubleshoot email issues
• What is the External label on Outlook mobile email?