Look up SPF, common DKIM selectors, and DMARC TXT records for a domain or URL hostname.
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Free · API · MCPToolYour platform
Use SPF / DKIM / DMARC Checker three ways
The free SPF / DKIM / DMARC Checker on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the security-apis module under Security Tools.
- Free in browserUse SPF / DKIM / DMARC Checker here — no account required.
- REST APICall from your server with
X-Api-Key. - MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.
- 1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
- 2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
- 3. Same qualityOutput matches the free web tool across all three surfaces.
What is SPF / DKIM / DMARC Checker?
Email deliverability and spoofing defense start with DNS: SPF at the apex, DKIM selectors, and DMARC at _dmarc. ToolYour SPF/DKIM/DMARC Checker looks up TXT records for a domain (or URL hostname), probes common DKIM selectors, and scores presence with fix advice. Custom ESP selectors may not appear — check your provider docs. REST/MCP: /api/v1/security-apis/spf-dkim-dmarc-checker.
What are common questions about SPF / DKIM / DMARC Checker?
Why is DKIM only a warning when missing?
We probe common selectors (google, selector1, default, …). Your ESP may use a custom name we did not try — confirm in their control panel.
Can I pass a full URL?
Yes — we extract the hostname. Bare domains like example.com also work.
What are the key features of SPF / DKIM / DMARC Checker?
SPF + DKIM + DMARC together
One report instead of three thin DNS tools.
Record snippets
Shows found TXT values truncated for readability.
How do you use SPF / DKIM / DMARC Checker?
Enter the sending domain
Use the apex you publish SPF for (often the From domain).
Publish missing records
Add SPF, then DKIM from your ESP, then DMARC starting at p=none if needed.
Rollout tip
Start DMARC at p=none with rua reporting, fix alignment, then move to quarantine/reject. Pair with TLS and headers checks for a broader web posture.
Where do you browse more security tools tools?
- Security Tools tools
Browse the full Security Tools category on ToolYour.
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