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Subject: Mail delivery failed: returning message to sender
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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:
wordpressdevnorway@gmail.com
host gmail-smtp-in.l.google.com [64.233.188.27]
SMTP error from remote mail server after end of data:
550-5.7.26 Your email has been blocked because the sender is unauthenticated.
550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.
550-5.7.26
550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass
550-5.7.26 SPF [hosting-a39.vpsttt.com] with ip:
[103.178.235.9] = did not pass
550-5.7.26
550-5.7.26 For instructions on setting up authentication, go to
550 5.7.26 https://support.google.com/mail/answer/81126#authentication d2e1a72fcca58-7e2b05da27esi955820b3a.459 - gsmtp
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Content-type: message/delivery-status
Reporting-MTA: dns; hosting-a39.vpsttt.com
Action: failed
Final-Recipient: rfc822;wordpressdevnorway@gmail.com
Status: 5.0.0
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 Your email has been blocked because the sender is unauthenticated.
550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.
550-5.7.26
550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass
550-5.7.26 SPF [hosting-a39.vpsttt.com] with ip: [103.178.235.9] = did not pass
550-5.7.26
550-5.7.26 For instructions on setting up authentication, go to
550 5.7.26 https://support.google.com/mail/answer/81126#authentication d2e1a72fcca58-7e2b05da27esi955820b3a.459 - gsmtp
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From: ntu100@hosting-a39.vpsttt.com
Date: Thu, 04 Dec 2025 20:50:41 +0700
www.ntu100.vpsttt.vn//wp-includes/images/crystal/wp-setupe.php
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