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MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
Whoisology - Connected database of whois records and whois history
intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
DNSInspect - DNS is a free online service to check your domain’s servers for common DNS and mail errors and produces a report with explanations how to fix them.
JSON WHOIS API - Parsed domain WHOIS data from any WHOIS server via RESTful API with metered pay as you pricing.