Message

Delivery Status Notification (Failure)

From: Mail Delivery Subsystem <[email protected]>

** Address not found **

Your message wasn't delivered to [email protected] because the address couldn't be found, or is unable to receive mail.

Learn more here: https://aka.ms/EXOSmtpErrors
(Warning: This link will take you to a third-party site)

The response from the remote server was:
550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [SJ5PEPF00000206.namprd05.prod.outlook.com 2025-12-17T01:42:51.414Z 08DE3A6211DCC6DA]


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Address not found
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Your message wasn't delivered to <a style='color:#212121;text-decoration:none'><b>[email protected]</b></a> because the address couldn't be found, or is unable to receive mail.
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<a style="text-decoration:none" href="https://aka.ms/EXOSmtpErrors">LEARN MORE</a>
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This link will take you to a third-party site
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The response from the remote server was:<br/>
<p style="font-family:monospace">
550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [SJ5PEPF00000206.namprd05.prod.outlook.com 2025-12-17T01:42:51.414Z 08DE3A6211DCC6DA]
</p>
</td>
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</body>
</html>

Final-Recipient: rfc822; [email protected]
Action: failed
Status: 5.4.1
Remote-MTA: dns; echo-com.mail.protection.outlook.com. (2a01:111:f403:c902::5,
 the server for the domain echo.com.)
Diagnostic-Code: smtp; 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [SJ5PEPF00000206.namprd05.prod.outlook.com 2025-12-17T01:42:51.414Z 08DE3A6211DCC6DA]
Last-Attempt-Date: Tue, 16 Dec 2025 17:42:51 -0800 (PST)

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 956f58d0204a3-645555eb876mr9868455d50.39.1765935770220; Tue, 16 Dec 2025
 17:42:50 -0800 (PST)
MIME-Version: 1.0
From: Antoinette Web <[email protected]>
Date: Wed, 17 Dec 2025 02:42:37 +0100
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Message-ID: <CANEwiSzxZOhojeSPJ+KPKXGVTS4ZAvWLtGH+ddWh_S+Yj8UsYQ@mail.gmail.com>
Subject: Doug, regarding the platform and innovation at echo
To: [email protected]
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