DNS Doctor - DNS & DMARC Tools listing history

Check, fix and verify any domain's DNS, explained in plain English. DNS Doctor reads the records behind a domain, tells you what is wrong and why, and gives you the exact record to publish when there is one.

Scan a domain for email authentication (SPF, DKIM, DMARC), mail routing (MX), DNS health, blacklists and domain and SSL certificate expiry. Look up any record on the domain's own nameservers, see whether a change has reached resolvers in six locations, check reverse DNS for a mail server, count SPF lookups, audit the third-party includes an SPF record trusts, and read a domain's registration: registrar, expiry, nameservers and locks.

DMARC records are generated and validated by a deterministic engine that follows the RFCs. The AI writes the explanation, never the record. SPF is diagnosed but never rewritten, because a changed SPF record can silently cut off a real sender. Nothing is applied to your DNS: you publish every record yourself.

Connect your DNS Doctor account to work with your monitored domains from ChatGPT: add a domain, check its ownership record, and read the alerts DNS Doctor raises for record changes, expiry, blacklisting, registrar or nameserver changes and new email senders seen in DMARC reports. It also tells you when that report evidence says it is safe to move DMARC from none to quarantine and then to reject.