Reporting-MTA: dns;MWHPR08MB10108.namprd08.prod.outlook.com
Received-From-MTA: dns;CY7PR03CU001.outbound.protection.outlook.com
Arrival-Date: Mon, 24 Nov 2025 19:44:41 +0000

Final-Recipient: rfc822;americanexpress@yale.edu
Action: failed
Status: 5.4.14
Diagnostic-Code: smtp;554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [MN1PEPF0000F0E1.namprd04.prod.outlook.com 2025-11-24T19:44:47.580Z 08DE2A0C30ECE125]
Remote-MTA: dns;MN1PEPF0000F0E1.mail.protection.outlook.com
X-Display-Name: American Express

