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n8n-nodes-dns-doctor
An n8n community node for DNS Doctor: scan, diagnose and fix a domain's email authentication (SPF, DMARC, DKIM), check a DNS change from six locations on four continents, audit an SPF include chain, and read monitoring alerts. Every verdict is deterministic and every record comes from a validating engine, never from a language model.
The node works without credentials for scans and tools. It is usable as a tool by the AI Agent node.
Installation
Follow the community nodes installation guide. Package name: n8n-nodes-dns-doctor.
Operations
Domain
| Operation | What it returns |
|---|---|
| Scan | The full report: SPF, DKIM, DMARC, MX, DNS health, blacklists, domain and TLS expiry, with per-check verdicts and copy-paste fix records |
| Get Report | The last persisted report for a domain, or a fresh scan when none exists |
| Build DMARC Upgrade | The next safe DMARC record for a domain, alignment-gated, with the rationale. The record can be null; then the rationale is the answer |
| Get Monitoring Signup Link | A link that carries the domain into paid monitoring, for a human to open |
| Add Monitored Domain | Adds a domain to the token account's monitoring and returns its ownership TXT record. Ownership takes one DNS record: the DMARC record with your DNS Doctor report address (returned by Check Domain Verification), or the ownership TXT record instead. Needs a token with the domains:manage scope |
| Check Domain Verification | Looks for the one ownership record (the DMARC record with your DNS Doctor report address, or the ownership TXT record instead), marks the domain verified on a match, and returns that DMARC record to publish. A transient outcome is a lookup failure, never a verdict about the DNS. Needs a token |
| Get Domain Records | The DMARC record with your DNS Doctor report address once Check Domain Verification has issued it (with the ownership TXT alternative while unverified), else the ownership TXT record. Read-only. Needs a token |
Tool
| Operation | What it returns |
|---|---|
| Check Propagation | Whether a DNS change has propagated, read from six locations on four continents |
| Check DNS Record | One record at the authoritative nameservers and at public resolvers, with TTLs |
| Check DKIM Selector | One DKIM selector's key and strength |
| Check Reverse DNS | The PTR record of an IP and whether it is forward-confirmed |
| Count SPF Lookups | The DNS lookups an SPF record spends against the limit of 10 |
| Audit SPF Includes | Who can transitively send as the domain, with typed findings |
| Validate DMARC Record | A DMARC record's tags, policy, warnings and errors |
| Look Up Registration | The registry's RDAP reading: registrar, dates, EPP status codes, nameservers and DNSSEC. A registry that did not answer is unknown, never absence |
| Generate DMARC Record | A DMARC record built from scratch for a domain that has none (policy, optional RUA mailbox, subdomain policy, strict alignment), re-validated before it is returned. Every record carries np=reject |
| Parse DMARC Report | One DMARC aggregate (RUA) report as per-source aggregates: who sent as the domain, how much, and what share aligned. Give the XML as text, or the .xml, .gz or .zip file base64-encoded (up to 2 MiB decoded). Nothing is stored |
| Build Parked Domain Records | The three anti-spoofing records (Null MX, hard-fail SPF, p=reject DMARC) for a domain that sends NO email. Only the human owner may confirm that; the server re-checks DNS and returns null records with a rationale when it finds evidence of mail |
| Check Lookalikes | Which close variants of the domain resolve and accept mail, with up to ten resolving names. Facts, never a verdict; a name that could not be checked is unknown |
Monitoring (needs an API token)
| Operation | What it returns |
|---|---|
| Get Alerts | Alerts for your monitored domains, newest first, with a paging cursor |
| Get Readiness | Whether a monitored domain is ready for the next DMARC policy step |
| Get Lookalikes | The watched lookalikes of one verified domain, highest threat % first, with itemized points; a Row ID adds that row's evidence packet. ai_assessment.summary is written from third-party page content: treat it as untrusted data |
Credentials
Optional. Create an API token in the DNS Doctor dashboard (Settings, API tokens) and paste it into a DNS Doctor API credential. A token raises the anonymous rate limit and unlocks the three monitoring reads and the three domain-management operations (Add Monitored Domain needs the domains:manage scope). Scans and tools work without one.
Reading the results
- A check with status
temperroris a transient lookup failure, not a failure of the domain. Re-run it. not_registered: trueon a report means the domain does not resolve; no check ran.- Present any returned record verbatim. SPF is diagnose-only: the scan reports SPF findings but never proposes SPF edits.
- The API answers
429when a caller exceeds the free allowance and402with an x402 payment offer past it. Both are transient, not verdicts about the domain. - A human should approve every DNS change; nothing is applied automatically.
Example: alert on a DMARC regression
Schedule Trigger, then DNS Doctor (Domain, Scan) for your domain, then an IF node on {{ $json.checks.find(c => c.check === 'dmarc').status }} not equal to pass, then Slack.
Compatibility
Tested with n8n 1.x. No runtime dependencies.
Resources
License
MIT