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 [AM3PEPF00009B9F.eurprd04.prod.outlook.com 2023-10-24T11:39:03.032Z 08DBD245582C4DD2]