DKIM record checker

Verify your DKIM signature is published correctly so receivers can confirm your emails are genuine and untampered.

Free · No signup · Runs in your browser

DKIM / inputlookupfig.

DomainSelectore.g. google, default, k1

Live DNS lookup · 20 checks/day

DKIM / resultreportfig.

Enter a domain and run the check to see a full report.

About DKIM

What DKIM proves

Cryptographic signing

DKIM adds a digital signature to your mail so receivers can verify it really came from you, untampered.

Found by selector

DKIM keys live at selector._domainkey.yourdomain.com — you need the selector your provider uses.

2048-bit keys

Modern DKIM keys should be at least 1024-bit, ideally 2048-bit, for strong security.

FAQ4 entries

DKIM Checker — FAQ

Still curious? Our team responds in under an hour.

Talk to sales

A label your email provider uses to publish its DKIM public key at selector._domainkey.yourdomain.com. Common selectors are google, default, k1 and s1.

Check a sent email's headers for the DKIM-Signature line and look for s=. Your provider's docs also list the selector to use.

DKIM lets receivers confirm your message wasn't altered in transit and genuinely came from your domain — a core deliverability and anti-spoofing signal.

At least 1024-bit, but 2048-bit is recommended where your DNS provider supports it.

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