![]() ![]() ![]() Here are 5 different solutions you can try.You might not need to try all of them. I sent a message and got error code 5.1.x in an NDR. Mail flow problems can be frustrating, but we have solutions you can try in order to get your message sent. Office 365 Admin Microsoft 365 Business Last updated This topic can help you fix email problems that are associated with error codes 550 5.1.1 through 5.1.20 if you see this in a non-delivery report (NDR).
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