Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Thu, 9 Oct 2025 08:16:27 -0500

The original message was received at Thu, 9 Oct 2025 08:16:26 -0500
from m0440770.ppops.net [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [CH2PEPF0000009C.namprd02.prod.outlook.com 2025-10-09T13:16:27.756Z 08DE038BDA50F7DD])

   ----- Transcript of session follows -----
... while talking to afamilylegacy-com.mail.protection.outlook.com.:
>>> DATA
<<< 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [CH2PEPF0000009C.namprd02.prod.outlook.com 2025-10-09T13:16:27.756Z 08DE038BDA50F7DD]
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.5.2 Need rcpt command [CH2PEPF0000009C.namprd02.prod.outlook.com 2025-10-09T13:16:27.756Z 08DE038BDA50F7DD]