Use the information in the NDR to help you decide how to fix the problem. The information here applies to a range of error codes 5.4.6 through 5.4.20. Some causes and solutions are provided in this topic.ĥ.4.6 indicates a mail loop or routing problem in on-premises Exchange Server, which you would likely encounter in a hybrid environment.ĥ.4.14 indicates a mail loop or routing problem in Exchange Online.
The most likely cause is the message hop count being exceeded or the route through which the message is delivered being broken. This topic describes what you can do if see the error codes 5.4.6, 5.4.14 or other error codes related to mail routing loops 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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