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

The Approved 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 always deliver 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 always deliver messages from through

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

Last updated March 3, 2023