Generate and validate DKIM signatures and DNS records. Debug authentication failures and scan domains for existing DKIM configurations.
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DNS record checking — Validates DKIM TXT records for any domain + selector
Multi-selector scanning — Probes 15 common selectors (Google, Microsoft 365, Mandrill, etc.)
DKIM header parsing — Extracts and explains all tags from DKIM-Signature headers
DNS record template generation — Creates ready-to-paste TXT records for new domains
Key size validation — Warns on weak keys (< 1024 bits)
Tag descriptions — Human-readable explanations of every DKIM tag (v, a, b, bh, c, d, h, s, etc.)
Configure DKIM Validator parameters to see how the product works.
# Check DKIM for a domain with default selector python src/dkim_validator.py check example.com # Check with a specific selector python src/dkim_validator.py check example.com --selector google # Scan for all DKIM selectors on a domain python src/dkim_validator.py scan example.com # Generate a DKI