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 [AM0EUR02FT060.eop-EUR02.prod.protection.outlook.com 2023-02-20T10:17:16.599Z 08DB0F6B81B58830]