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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 93.184.216.1 through 93.184.216.255:


NOTE: this will also block messages that passed through a server in the IP range.


Last updated March 13, 2019