Fix email delivery issues for error code 5.7.64 in Office 365

This topic will walk you through the steps of what to do if you see status code 5.7.64 in a non-delivery report (NDR) or delivery status notification (DSN). Content for this help topic will be available at a later date.

Status code 5.7.64

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See Also

What are Exchange NDRs in Exchange Online and Office 365