Typically, an email loop starts when Office 365 thinks a recipient doesn't exist in the service. If the MX record for the ...

Typically, an email loop starts when Office 365 thinks a recipient doesn't exist in the service. If the MX record for the recipient's domain points to Office 365, or if the destination messaging server thinks the recipient is in Office 365, the message is delivered back to Office 365, and the process repeats itself.

The root cause is usually a non-existent recipient, or a spelling error in the recipient's email address. We've found one or more email loops for your organization. See the details and instructions on how to fix the issue below.
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