To add Abusix Mail Intelligence to your Barracuda Spam Firewall go to:
BLOCK/ACCEPT -> IP Reputation and under Custom External RBLs add:
(replace "your_api_key" with the API key shown in your dashboard).
And select select "BLOCK".
Once set-up, you will start to see "Blocked" items in the Message Log and you'll see within those that they were blocked by Abusix Mail Intelligence.