554 5.4 14 Hop Count Exceeded Possible Mail Loop Attr34
554 5414 Hop count exceeded - possible mail loop ATTR34. For the steps see Add a domain to Microsoft 365.
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This behavior occurs by design when you have one or more unverified domains in Microsoft 365.
. If you see any of the following smtp responses logged you then should be open a support case for further investigation. 546 indicates a mail loop or routing problem in on-premises Exchange Server which you would likely encounter in a hybrid environment. The most likely cause is the message hop count being exceeded or the route through which the message is delivered being broken.
If this fix doesnt fit or work for your business needs contact Support for further. Some causes and solutions are provided in this topic. To resolve this behavior add and verify the missing domains.
454 4415 Hop count exceeded. 554 5414 Hop Count exceeded - possible mail loop ATTR34. We protocol these if a threshold associated with quarantine or ATP has been reached and a message has been dropped by the service.
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