Free SPF, DKIM & DMARC Checker

Look up MX, SPF, common DKIM selectors, and DMARC for any domain. Add a custom DKIM selector if your ESP uses one we do not try by default.

Email deliverability

SPF, DKIM, and DMARC

Look up MX plus SPF, common DKIM selectors, and _dmarc for any domain. Optional custom DKIM selector.

How to use

How to use Email Auth

1
Enter the sending domain
The apex you send from (usually without www).
2
Add a selector if you have one
Optional. Leave blank to try google, selector1, k1, and others.
3
Fix failing checks
Publish one SPF TXT, at least one DKIM selector, and a _dmarc record.

Guide

How to check email authentication

Launch week newsletters fail when SPF, DKIM, or DMARC are missing. Receivers treat unsigned mail as spam.

Start with p=none on DMARC to monitor, then move to quarantine or reject once SPF and DKIM align with your ESP.

DKIM selectors are not guessable. We try common names; paste the selector from Google Workspace, Resend, Postmark, or Mailgun if needed.

Explore more on free ScrollLaunch tools, browse DR-ranked directories, or launch with a dofollow backlink.

Questions

Email Auth FAQ

What are SPF, DKIM, and DMARC?

SPF lists which servers may send mail for the domain. DKIM signs messages. DMARC tells receivers what to do when those checks fail (none, quarantine, or reject).

Why is DKIM missing?

DKIM lives at selector._domainkey.example.com. We try common selectors (google, selector1, k1, …). Paste your ESP selector if it is custom.

Does this send test email?

No - DNS only. For all record types use the DNS lookup.

DNS Lookup

Free DNS lookup - A, AAAA, CNAME, MX, NS, TXT, and SOA records for any domain.

SSL Checker

Free SSL checker - certificate validity, expiry, issuer, and SAN names.

HTTP Header Checker

Free HTTP header checker - inspect status, security headers, caching, and X-Robots-Tag.

WHOIS Lookup & Domain Age

Free WHOIS and domain age checker - registration date, expiry, registrar, and nameservers via RDAP.