Ensuring Your Email is Not Marked as Spam in Office 365
Email being delivered from Email Protection to Office 365 is sometimes incorrectly identified as spam, which results in delayed or failed email delivery. To avoid this, Email Protection IP ranges should be added to your Microsoft 365 Defender.
Follow these steps to add the Email Protection IP ranges to your Office 365 connection filter policy:
- Log in to Microsoft 365 Defender.
- Under 'Email & Collaboration' in the sidebar menu, go to 'Policies & rules' > 'Threat policies' and select 'Anti-spam' in the Policies section.
- Click 'Connection filter policy (Default)' and the 'Connection filter policy (Default) window' slides from the right.
- Click 'Edit connection filter policy'.
- In 'Always allow messages from the following IP addresses or address range':, add your inbound Email Protection IP ranges. See Email Protection Servers.
- Check the 'Turn on safe list' checkbox.
Note: If you experience issues editing the connection, do not check 'Turn on safe list' at this stage. Add the Email Protection IPs in Step 5, uncheck 'Turn on safe list' and proceed to Save. - Click 'Save'
- If you were unable to turn on safe senders in Step 6, edit your connection and check 'Turn on safe list' now.
See Use the Microsoft 365 Defender portal to modify the default connection filter policy for additional information.