Email Verification API
Validate every address in real time and block disposable, invalid, and trap emails at signup.
Cold Email & Outreach · Free forever
Free SPF DKIM DMARC Record Checker
Ensure Your Domain Is Authenticated for Cold Outreach
Enter your domain to validate SPF, DKIM and DMARC records. Essential for cold email senders to avoid Gmail and Outlook spam filters.
Run the tool
This tool performs a live lookup (DNS, WHOIS, or a page fetch) that a browser cannot do on its own, so the value you enter is sent to our server for that check. It is not stored. If the lookup is unavailable, the tool falls back to its offline formula and tells you.
Under the hood
How this tool works
No black box. This is the exact logic the tool runs on every input you give it.
Formula
Auth = SPF(pass) ∧ DKIM(aligned) ∧ DMARC(p=policy) — all three must align on the From: domain
- 1
Validate and normalise your input so the output is always well-formed.
- 2
Apply the construction rule in the formula above, deterministically.
- 3
Render the artefact — code, link, record, or snippet — ready to copy.
- 4
Include the notes that stop the usual mistakes when you paste it live.
Need this at scale?
Two Govarova products that do this automatically
The free tool handles one input at a time. These handle millions — verified, enriched, and ready to send.
Govarova Outreach
Run multi-step cold email cadences with AI personalisation, tracking, and a built-in CRM.
More free cold email & outreach tools
Register & start — free
Run Free SPF DKIM DMARC Validator as often as you like. When you are ready to do it across your whole market, Govarova is waiting.