Zoho IP address blocked by Microsoft
Today I tried to send emails to Outlook email addresses and all of them failed.
The log displays like this:
Reporting-MTA: dns; mx.zohomail.jp
Arrival-Date: Fri, 27 Jun 2025 12:52:30 +0800
Status: 550
Action: failed
Last-Attempt-Date: 27 Jun 2025 04:52:35 GMT
Diagnostic-Code: 5.7.1 Unfortunately, messages from [103.163.153.3] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BB623997EA6CC0] [SA2PEPF00001508.namprd04.prod.outlook.com 2025-06-27T04:52:35.747Z 08DDB11CD1D80CE8]
Remote-MTA: dns; outlook-com.olc.protection.outlook.com
What should I do to solve the problem? Or do I need to wait for Zoho to contact Microsoft?
Thanks a lot.