What is a DNS Real-Time Blackhole ListA DNS real-time blackhole list is an online database that blocks emails from IP addresses or domains that are suspected of sending spam or phishing messages. It scans your IP or domain against major blocklists and notifies you if any DNS blackhole list has flagged you. The blackhole list reads this data and assumes your IP is sending unwanted mail. If your server is set up poorly and behaves like this, the DNS blackhole list catches it fast and adds you to the list. Step 3: Wait For RemovalOnce you have generated the request, wait for your IP address to be removed from the DNS-based blackhole list.