Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 22 Oct 2025 04:08:44 -0400

The original message was received at Wed, 22 Oct 2025 04:08:42 -0400
from m0090834.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 [MWH0EPF000971E2.namprd02.prod.outlook.com 2025-10-22T08:08:44.139Z 08DE0D4CBB432B74])

   ----- Transcript of session follows -----
... while talking to lairdtech-com.mail.protection.outlook.com.:
>>> DATA
<<< 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [MWH0EPF000971E2.namprd02.prod.outlook.com 2025-10-22T08:08:44.139Z 08DE0D4CBB432B74]
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.5.2 Need rcpt command [MWH0EPF000971E2.namprd02.prod.outlook.com 2025-10-22T08:08:44.140Z 08DE0D4CBB432B74]