All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevent tools and information. And you'll have a chronological history of your results. If you already know exactly what you want, you can force a particular test or lookup. Try some of these examples: (e.g. "blacklist: 127.0.0.2" will do a blacklist lookup)
Feedback: If you run into any problems with the site or have an idea that you think would make it better, we would appreciate your feedback. Please leave us a note in our forums.