Check SPF, DKIM, and DMARC DNS records for any domain and diagnose deliverability issues. Know why your emails land in spam.
Browse the actual product documentation and code examples included in this toolkit.
Key features of Deliverability Checker
• SPF record validation — Parses and validates SPF TXT records, detects too many DNS lookups • DMARC record checking — Validates policy, alignment, and reporting configuration • DKIM record lookup — Checks DKIM DNS records with multi-selector support • MX record resolution — Verifies mail exchange records exist and resolve • Deliverability scoring — 0-100 score based on authentication completeness • Batch domain checking — Check multiple domains from a file
SPF record validation — Parses and validates SPF TXT records, detects too many DNS lookups
DMARC record checking — Validates policy, alignment, and reporting configuration
DKIM record lookup — Checks DKIM DNS records with multi-selector support
MX record resolution — Verifies mail exchange records exist and resolve
Deliverability scoring — 0-100 score based on authentication completeness
Batch domain checking — Check multiple domains from a file
Configure Deliverability Checker parameters to see how the product works.
# Check a single domain python src/deliverability_checker.py example.com # Verbose output with full record details python src/deliverability_checker.py example.com --verbose # Check with a specific DKIM selector python src/deliverability_checker.py example.com --dkim-selector google # Check multi