Thank you for your post.
The option to blacklist a domain or entire top level domains is at the moment only available in MagicSpam PRO for Plesk and WHM/cPanel.
If you are having an issue with an uncaught spam on your system, it would be helpful if you could send us your MagicSpam logs for analysis at:
To retrieve MagicSpam logs, you can use the MagicSpam interface and access the "Logs" tab.
In the log search result output, you have the option to export/save the log search results to a CSV file. Once you have the CSV file, you can email that as an attachment to us for examination using your email client.
Please make sure that you remove entries where mua=yes and highlight only HAM entries that are spam.
Also, can you please send us screenshots of the following two tabs in your MagicSpam control panel:
Settings / Server Policies
Settings / IP Reputation
With the requested information, we will be able to provide better suggestions for addressing the uncaught spam issue.