It is against Outlook.com policy to send mail from a machine which is an open proxy server, and it will be blocked from accessing some or all of Outlook.com servers as long as it remains in that state.
Deliverability to Outlook.com is based on your reputation. The Outlook.com Smart Network Data Services (SNDS) gives you the data you need to understand and improve your reputation at Outlook.com.
The goal for Outlook.com is to offer a comprehensive and usable email service that helps detect and protect users from junk email, fraudulent email threats (phishing) and viruses.
Senders attempting to send email to Outlook.com users should ensure they fully understand and are following the guidance on this page to help in this effort and to help avoid potential deliverability issues.
Therefore, we have built some services to help ISPs gain a good understanding of the type of traffic originating from their networks and reaching Outlook.com customers.
Announcements: Click here to see new updates for SNDS. Updated December 4th, 2025 Outlook.com Outbound IP Space Outlook.com sends e-mail from the following IP addresses: 40.92.0.0/14
Warning: Access to Torus Has Changed As of July 22nd 2024 usage of Torus now requires a Secure Access Workstation (SAW) device. Only permitted scenarios or breakglass-emergencies may use the Torus Client on this device.
