Request for Delisting IP 192.99.8.129 and Review of Outlook/Hotmail Blocking

Dear Microsoft Outlook Deliverability Team,

We respectfully request a review and removal of the block currently affecting our mail server IP address 192.99.8.129.

We have recently discovered that emails sent from our server are being rejected by Outlook/Hotmail with error code S3150, indicating that our IP or a portion of the network is listed on Microsoft's block list.

We take email security and compliance very seriously. Our server is used for legitimate business communications only, and we have conducted a thorough review of our systems to ensure that:

No spam campaigns are being sent.

No compromised accounts are present.

Email authentication records (SPF, DKIM, and DMARC) are properly configured.

Server security measures are actively maintained and monitored.

Abuse prevention and rate-limiting controls are in place.

We believe this block may be the result of previous activity associated with the IP range or an incorrect reputation assessment. We kindly ask your team to review the reputation of IP address 192.99.8.129 and remove any restrictions if possible.

Our business relies on the ability to communicate with customers and partners using Outlook and Hotmail services, and we are committed to maintaining full compliance with Microsoft's email sending policies.

We appreciate your time and assistance and would be grateful for any information regarding the cause of the block or additional actions required from our side.

IP Address: 192.99.8.129

Domain: nourhost.co

Thank you for your consideration.

Kind Regards,

Anas Osama

Founder & CEO

Nour Host