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Free Email Authentication Checker
Check your domain’s SPF, DKIM, and DMARC records in one click — then fix what’s broken. Catch the misconfigurations quietly sending your email to spam.
We run live DNS lookups in your browser — nothing is stored. Leave the selector blank and we’ll try the common ones (google, default, selector1…).
DMARC Record Generator
No DMARC record yet? Build a valid one below and paste it into your DNS as a TXT record at _dmarc.yourdomain.com.
v=DMARC1; p=none; pct=100;Authentication is only half the battle.
Perfect SPF, DKIM & DMARC still won’t save you if 1 in 5 addresses on your list is dead. Invalid emails spike your bounce rate and torch the sender reputation you just fixed. Verify your list first.
Verify 100 emails free →SPF, DKIM & DMARC — quick answers
What is SPF?
SPF (Sender Policy Framework) is a DNS TXT record listing which servers are allowed to send email for your domain. Receiving servers check it to confirm a message really came from you. A missing or misconfigured SPF record is one of the most common reasons legitimate email lands in spam.
What is DKIM and what’s a selector?
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to your email so receivers can verify it wasn’t tampered with. The public key lives at selector._domainkey.yourdomain.com. The “selector” is a label your email provider assigns (e.g. google for Workspace, selector1/selector2 for Microsoft 365). Enter it above, or we’ll try the common ones.
What is DMARC and why does p=none matter?
DMARC ties SPF and DKIM together and tells receivers what to do with mail that fails — and where to send reports. p=none only monitors; it offers no protection. Once you’ve reviewed reports, move to p=quarantine then p=reject to actually stop spoofing.
Does fixing authentication fix my deliverability?
It’s necessary but not sufficient. Authentication proves you are who you say you are — it does nothing about list quality. High bounce rates from dead or invalid addresses will still wreck your sender reputation. Clean the list, then keep it clean.