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help blocking someone doing password guessing

I have a ip that is repeating every min in my "user authentication daemon log" they are trying various username, I want to stop that ip all together, I have made a rule in the past in the firewall to drop all packets coming from a group that I created and added this one into it, but they continue to try. So I found the box "drop packets from blocked hosts" under Authentication Servers /Advanced.  I checked it and it still continues, so my question is where do you type in the blocked hosts?

version 9.105-9. thanks for any help you may over to stop this ip guessing emails from caller="smtp"


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