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Free tool · RFC 6376 & RFC 8301
DKIM Checker & Generator
Check that your emails are signed with a strong DKIM key, and generate a new key pair safely in your browser for servers that need one.
- Finds common selectors
- Key size check
- RSA & Ed25519 keys
Nothing you enter is stored. Checks only read public DNS, and keys are generated inside your browser, so the private key never reaches our server.
How it works
Three checks, one decision
Every email that claims to be from you is checked with SPF, DKIM and DMARC. Real mail passes and lands in the inbox. A fake one fails, and your DMARC policy blocks it.
Authentication
Authentication
Authentication
Best practice, your way
Free tools. Expert help when you want it.
The free tools get you started. Keys need rotating and new services need signing, so let our specialists set up DKIM, SPF and DMARC to current best practice.
Free tools
Do it yourself, anytime
Includes
- DKIM checker and key generator
- SPF and DMARC tools
- Email Security Checker with PDF report
Easy to miss on your own
- Third-party senders that never sign with DKIM
- Old 1024-bit keys that are never rotated
- Private keys left on old servers
DKIM & DMARC Setup
Done for you, to best practice
Everything in Free, plus
- DKIM turned on for Microsoft 365 or Google Workspace
- Every service that sends as you signs with your domain
- SPF and DMARC set up to match
- Plain-English summary when done
Handled for you
- DKIM switched on in your admin console
- Third-party senders signing as you
- Test emails checked for dkim=pass
Managed Email Security
Looked after, month to month
Everything in Setup, plus
- DMARC reports read and acted on
- Key rotation on a schedule
- New senders signed before they go live
- Monthly plain-English report
Peace of mind
- Keys rotated on a schedule
- New services signed before go-live
- One team to call when email changes
Keep going