Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Thu, 15 Jan 2026 05:11:59 -0600

The original message was received at Thu, 15 Jan 2026 05:11:58 -0600
from m0462439.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 [BN2PEPF000044A7.namprd04.prod.outlook.com 2026-01-15T11:11:59.506Z 08DE4E8A32792406])

   ----- Transcript of session follows -----
... while talking to regalbeloit.mail.protection.outlook.com.:
>>> DATA
<<< 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [BN2PEPF000044A7.namprd04.prod.outlook.com 2026-01-15T11:11:59.506Z 08DE4E8A32792406]
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.5.2 Need rcpt command [BN2PEPF000044A7.namprd04.prod.outlook.com 2026-01-15T11:11:59.506Z 08DE4E8A32792406]