Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Mon, 6 Oct 2025 07:20:27 -0500

The original message was received at Mon, 6 Oct 2025 07:20:26 -0500
from m0440771.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 [BL02EPF0001A100.namprd03.prod.outlook.com 2025-10-06T12:20:27.543Z 08DE037A079213B4])

   ----- 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 [BL02EPF0001A100.namprd03.prod.outlook.com 2025-10-06T12:20:27.543Z 08DE037A079213B4]
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.5.2 Need rcpt command [BL02EPF0001A100.namprd03.prod.outlook.com 2025-10-06T12:20:27.543Z 08DE037A079213B4]