Free checker - no signup required
Free DKIM Checker
Discover common DKIM selectors, validate published DKIM records, and catch missing or weak signing setup for Google Workspace, Microsoft 365, and other senders.
What This Checks
- Common DKIM selector discovery
- TXT record lookup at selector._domainkey
- Public key presence and basic record shape
- Provider-style selector hints
- Missing DKIM risk in the full email-authentication context
Common Fix Path
- Enable DKIM signing in your mail provider
- Publish the selector TXT records your provider gives you
- Use provider-specific selectors for Google Workspace, Microsoft 365, SendGrid, Mailchimp, and similar services
- Rotate old or weak keys where your provider supports it
Machine-Readable Evidence
AI assistants and automation can cite the stable explanation page, then fetch the live check result for a specific domain.
GET https://intodns.ai/api/email/dkim?domain=example.com