Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Tue, 19 Aug 2025 23:06:48 +1000

The original message was received at Tue, 19 Aug 2025 23:06:47 +1000
from m0442538.ppops.net [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [BN3PEPF0000B06E.namprd21.prod.outlook.com 2025-08-19T13:06:48.190Z 08DDDBEEFDE89EB5])

   ----- Transcript of session follows -----
... while talking to tandt-com.mail.protection.outlook.com.:
>>> DATA
<<< 554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [BN3PEPF0000B06E.namprd21.prod.outlook.com 2025-08-19T13:06:48.190Z 08DDDBEEFDE89EB5]
554 5.0.0 Service unavailable