MxToolBox allows users to find out whether a given domain has been blacklisted by checking its IP address against 105 DNS-based blacklists. Users can also verify reverse DNS records, perform simple open relay checks, and measure response times. Developers can use the REST-based MxToolBox API to determine whether their domain name or email server has been blacklisted.
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The MxToolbox PHP SDK by Nathan King wraps the API to access domain checkup data. Resources include lookup method and monitor method. Based in developer Michael Roterman's work at https://github.com/php-tmdb/api