![]() The destination email server that generated the 5.1.0 error won't accept messages from you (the sender) or messages for the recipient. Use the information in the NDR to help you decide how to fix the problem. This topic describes what you can do if you see error code 550 5.1.0 or 5.1.0 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN). ![]() It's frustrating when you get an error after sending an email message.
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