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Subject: Mail delivery failed: returning message to sender
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Date: Thu, 16 Apr 2026 18:53:46 -0400
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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:
kayintco@hotmail.com
host hotmail-com.olc.protection.outlook.com [52.101.68.4]
SMTP error from remote mail server after end of data:
550 5.7.515 Access denied, sending domain SERVER342.WEB-HOSTING.COM doesn't meet the required authentication level. The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender. To learn how to fix this[truncated]
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Diagnostic-Code: smtp; 550 5.7.515 Access denied, sending domain SERVER342.WEB-HOSTING.COM doesn't meet the required authentication level. The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender. To learn how to fix this see: https://go.microsoft.com/fwlink/p/?linkid=2319303 Spf= Fail , Dkim= Fail , DMARC= Fail [TYYPR01MB6572.jpnprd01.prod.outlook.com 2026-04-16T22:53:46.211Z 08DE9B9C128D7E1F] [DUZPR01CA0310.eurprd01.prod.exchangelabs.com 2026-04-16T22:53:46.325Z 08DE9BEF746B77E6] [DB1PEPF00039231.eurprd03.prod.outlook.com 2026-04-16T22:53:46.323Z 08DE99D33923C2A2]
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The backup process of plugins/theme of your WordPress installation has failed. So the auto upgrade plugins/theme process was not performed.
The details are as follows :
Installation URL : http://sunentjp.com
Error : Could not determine the database prefix for http://sunentjp.com
Could not determine the database prefix for http://sunentjp.com
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