May 19, 2019
Mail Delivery Subsystem Message
Message not delivered
Your message couldn't be delivered to blank email (I removed email address) because the remote server is misconfigured. See technical details below for more information.
The response from the remote server was:
554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [DM3NAM03FT016.eop-NAM03.prod.protection.outlook.com]
Informational notification.
This question is locked and replying has been disabled.
Community content may not be verified or up-to-date. Learn more.
All Replies (4)
May 19, 2019
They probably have a forwarding loop between a couple of accounts (mail loop). After the message goes around the loop a couple times it fails and bounced back to the sender. You'll have to contact them another way and alert them to the problem (they may not know yet).
May 19, 2019
May 19, 2019
Perhaps their forwarding is filter based. A study of the full headers would confirm/deny my theory (although the error is pretty clear).