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WhoisXML Reverse MX API MASTER RECORD

The WhoisXML Reverse MX API enables developers to discover all domains using the same mail server. It covers close to 1.5 billion domains and subdomains and updates more than 140 million MX records daily. This API could be used to identify connected domains that seem unrelated on the surface or to determine whether the developer is sharing their server with any malicious organizations that may cause them to be blacklisted.