Free, fast diagnostic tools for DNS, email authentication, and network security
Summary
The article presents a suite of free diagnostic tools from Mr.DNS for DNS, network, and email health checks. It covers DNS lookups, propagation, DNSSEC, Whois, port checks, blacklists, SSL/HTTP health, and SPF/DKIM/DMARC tooling, plus MTA-STS and BIMI support, targeting developers, network engineers, and email admins.