Why am I seeing an alert in Outlook telling me there are external recipients on my message?

For some enterprise users, depending on admin configuration, Outlook will notify you about whether external recipients are present when you compose or reply to a message. This notification MailTip provides additional information when messaging, so that you feel confident about who will receive your mail. If you dismiss the MailTip, it will disappear, but the recipients will remain in the address well. This MailTip is for informational purposes only.

Shows a draft email with an alert about external recipients.

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