Welcome to the Blocklist Tester!

You can use the Blocklist Tester (BLT) to check if your email servers are correctly configured to use the Spamhaus Blocklists.

How does it work? The BLT sends a series of test emails to your nominated email address. If your server is correctly set up to query our blocklists, all the emails should be rejected. The BLT provides a summary of exactly what emails have been rejected or delivered.

Getting started. Simply enter an email address for the server you would like to test. You will receive a verification message, and then you can start running tests. The email will only be used for testing purposes and a results history. You can delete your email at any time. For further details see our Quick Start section.