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The following describes how to add a visual warning when emails come from outside your organization. This makes phishing attempts far more obvious no matter how convincing the from address. https://www.securit360.com/blog/configure-warning-messages-office-365-emails-external-senders/
CAUTION: This email originated outside your organization. If the sender claims to be a co-worker be suspicious, do not click included links, and forward the email to IT.