Free SPF, DKIM & DMARC checker
Check a domain's email authentication in one go: SPF (with a recursive 10-lookup count), DMARC policy, DKIM keys at 20 common selectors (or your own), MX, MTA-STS, TLS-RPT and BIMI. Lookups are live over DNS-over-HTTPS.
Free weekly report (early access)
Leave your email and the domain you care about. We're rolling out free weekly email reports and will email you when yours starts. No spam: one email to confirm, then the reports. Unsubscribe or ask for deletion anytime.
We store your email, the domain and the time you signed up. See privacy.
Guides
DMARC
DMARC record generator (free)DMARC record for small business: what to setWhat is DMARC? Policy, alignment and reports explainedMoving DMARC from p=none to p=reject safelyDMARC aggregate (rua) reports: setup and reading them
Providers
SPF, DKIM and DMARC for Google WorkspaceSPF, DKIM and DMARC for Microsoft 365SPF, DKIM and DMARC for Zoho MailSPF, DKIM and DMARC for FastmailSPF, DKIM and DMARC for Proton MailSPF, DKIM and DMARC for Amazon SESSPF, DKIM and DMARC for SendGridSPF, DKIM and DMARC for MailgunSPF, DKIM and DMARC for MailchimpSPF, DKIM and DMARC for Zendesk
SPF
What is an SPF record? A plain-English guideSPF 10 DNS lookup limit: how to fix 'too many lookups'Multiple SPF records: how to merge them into oneSPF ~all vs -all: softfail or hardfail?