Safelisting Workshop IPs in Microsoft 365 Defender

To ensure that all emails created and sent through Workshop pass through M365, your email security appliance, we need you to Safelist our IP addresses.

• Sign into Office 365 and go to the "Security Center" https://security.microsoft.com/
• In the left side menu under “Email and collaboration” go to “Policies and rules”
• Click the “Threat policies” option
• Under “Policies” click “Anti-spam”
• Click “Connection filter policy (Default)” so the options appear on the right side and then click the “Edit connection filter policy” link
• Enter the IPs that correspond with your Workshop server to the “Always allow messages from the following IP addresses or address range” section

1. US SERVER 

   149.72.151.35
   149.72.183.8
   149.72.201.153
   149.72.22.42
   149.72.61.106
   159.183.141.212
   159.183.141.213
   159.183.141.214

2. EU SERVER

   159.183.224.19
   159.183.227.196
   159.183.229.133
   159.183.229.134

• Click “Save”