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https://bobcares.com/blog/how-to-fix-571-delivery-not-authorized-message-refused/
Sep 17, 2016 · ‘571 Delivery not authorized message refused’ error is commonly seen when mails sent to Exchange servers get rejected. Here's how to solve it.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/non-delivery-reports-in-exchange-online
47 rows · Delivery not authorized: The sender of the message is not allowed to send messages to the …
https://community.bt.com/t5/Email/Status-5-7-1-delivery-not-authorized-message-refused/td-p/1749012
Status: 5.7.1 (delivery not authorized, message refused) I looked at the thread but do not think it is relevant as it for failure message sending from the BT account, …
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