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How do I quarantine a sender based on an IP range?

The Blocked sender feature allows IP addresses but does not support IP ranges.

As a work around, you can use the Custom Filter rules (under Settings > Custom filters) to quarantine messages from a specific Class C network.  Your rule should search the Message header for the first 3 octets of the IP range (the first three sets of numbers). 

For example, the following Custom Filter rule would quarantine messages from through

This will also block messages that passed through a server in the IP range.

Last updated March 3, 2023