Subject: Returned mail: see transcript for details

From: postmaster <[email-masked]>
Date: Mon, 12 May 2025 08:21:01 +0200

The original message was received at Mon, 12 May 2025 08:20:26 +0200
from:
[email-masked]

   ----- 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 [DB1PEPF000509E5.eurprd03.prod.outlook.com 2025-05-12T06:21:01.865Z 08DD8AFFC4CE9033])

   ----- Transcript of session follows -----
... while talking to gavle.se.:
>>> DATA
<<< 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [DB1PEPF000509E5.eurprd03.prod.outlook.com 2025-05-12T06:21:01.865Z 08DD8AFFC4CE9033]
550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [DB1PEPF000509E5.eurprd03.prod.outlook.com 2025-05-12T06:21:01.865Z 08DD8AFFC4CE9033]
<<< 503 5.5.2 Need rcpt command [DB1PEPF000509E5.eurprd03.prod.outlook.com 2025-05-12T06:21:01.865Z 08DD8AFFC4CE9033]