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MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
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.
Dnsstuff - DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering.
intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
SolveDNS - SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.
DNS Checker Tool - Check Domain Name System (DNS) records for any website.