Welcome to checkdmarc’s documentation

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A Python module, command line utility, and web application for validating SPF and DMARC DNS records.

Features

  • API, CLI, and web interfaces

  • Can test multiple domains at once

  • CLI output in JSON or CSV format

  • DNSSEC validation

  • SPF

    • Record validation

    • Counting of DNS lookups and void lookups

    • Counting of lookups per include

  • DMARC

    • Validation and parsing of DMARC records

    • Shows warnings when the DMARC record is made ineffective by pct or sp values

    • Checks for authorization records on reporting email addresses

  • BIMI

    • Validation of the mark format and certificate

    • Parsing of the mark certificate

  • MX records

    • Preference

    • IPv4 and IPv6 addresses

    • Checks for STARTTLS

    • Use of DNSSEC/TLSA/DANE to pin certificates

  • MTA-STS

  • SMTP TLS reporting

    • Record and policy parsing and validation

  • SOA record parsing

  • Nameserver listing

Further reading

Indices and tables