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 [AMS1EPF00000042.eurprd04.prod.outlook.com 2023-11-20T22:03:30.892Z 08DBE84A5D30275C]