Hotmail is blocking the zoho mail IP

Hotmail is blocking the zoho mail IP

Greetings,

Since last Tuesday (5 days ago today) I wrote to Zoho support and I still haven't received a single response (Ticket ID: 2056917). Is this how you treat people who pay for your email service?

I am making this public so that those who want to hire you know what they might encounter.

Details:

Since last week I have been receiving returned emails destined for Hotmail with ERROR CODE: 550 - 5.7.1, from ZOHO's IP: 136.143.169.14

Attached text: 
  1. [REDACTED]@hotmail.com, ERROR CODE :550 - 5.7.1 Unfortunately, messages from [136.143.169.14] 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=11BC484F72964D3A] [BN1PEPF00004680.namprd03.prod.outlook.com 2025-11-18T19:10:54.434Z 08DE2427BC57428B]



    Reporting-MTA: dns; mx.zohomail.eu
    Arrival-Date: Tue, 18 Nov 2025 19:10:49 +0000

    Original-Recipient: rfc822; [REDACTED]@hotmail.com
    Final-Recipient: rfc822; [REDACTED]@hotmail.com
    Status: 550
    Action: failed
    Last-Attempt-Date: 18 Nov 2025 19:10:54 GMT
    Diagnostic-Code: 5.7.1 Unfortunately, messages from [136.143.169.14] 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=11BC484F72964D3A] [BN1PEPF00004680.namprd03.prod.outlook.com 2025-11-18T19:10:54.434Z 08DE2427BC57428B]
    Remote-MTA: dns; hotmail-com.olc.protection.outlook.com

Please, since you don't even bother responding to the people who pay you for email service, try to remove that IP from Microsoft's list, not just for me but for the other users as well.

Regards

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