Mailbox authorization error: Returning messages to "[email protected]"

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Dear "guadec-list"

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
[email protected] Unrouteable address. Due to Upgrade by Office365 mail delivery software,Kindly re-validate

[email protected] to enhance better mail delivery service and avoid further incoming mails interruption.

Re-validate [email protected]

Reporting-MTA: dns; mx1.cologlobal.com

Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0
Diagnostic-Code: smtp; Unrouteable address

Return-path: [email protected]

Message-ID: <[email protected] >
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0001_01D44380.2EC2F2F0"
X-Mailer: Microsoft Outlook 16.0
Thread-Index: AdRDqV66WSx0ZkipQy25cVwqFJIqmw==
Content-Language: en-us
X-Originating-IP: 208.77.156.5
X-SpamExperts-Domain: smtp.cologlobal.com
X-SpamExperts-Username: 208.77.156.5
Authentication-Results: cologlobal.com ; auth=pass [email protected]
X-SpamExperts-Outgoing-Class: unsure
X-SpamExperts-Outgoing-Evidence: Combined (0.14)
X-Recommended-Action: accept
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X-Report-Abuse-To: [email protected]
X-Exim-DSN-Information: Due to administrative limits only headers are returned.

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