Message not delivered

Your message couldn't be delivered to lander@hec.fr 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 [DB1PEPF00039232.eurprd03.prod.outlook.com 2023-09-01T08:28:10.745Z 08DBA75DE66DDEE3]