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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:
This will also block messages that passed through a server in the IP range.
Last updated March 3, 2023