Concurrent Blacklist Diagnostics
Ensure your mail server reputation is clean. We execute live, concurrent asynchronous queries against major RBLs (like Spamhaus and Barracuda) to instantly detect IP blacklisting, automatically resolve hostnames, and precisely decode exact loopback return codes for immediate remediation.
A perfect DMARC record won't save you if your server's IP is on a Real-time Blackhole List (RBL). We query major spam databases like Spamhaus, Barracuda, and Spamcop concurrently to ensure your IP reputation is clean.
Email deliverability relies heavily on trust. If your server IP is flagged by major anti-spam organizations, receiving networks will block your traffic entirely.
1.2.3.4) or a hostname (mail.example.com). The tool will automatically resolve the A-record and extract the correct IP to test.127.0.0.2) to indicate *why* you are blocked (e.g., Open Relay vs Known Spammer). We expose this exact code.Your feedback has been submitted successfully. We appreciate your help in improving our tools.