Welcome to checkdmarc’s documentation

checkdmarc is a Python module and command line parser for SPF and DMARC DNS records

Features

• API and CLI

• Can test multiple domains at once

• CLI output in JSON or CSV format

• Parsing and validation of many DNS records related to email

  • MX

    • Tests STARTTLS and TLS support on each mail server, including certificate validation

  • SPF

    • Counts the number of DNS lookups required in each part of the SPF record

  • DMARC

  • MTA-STS

    • Checks both the DNS record and the policy provided over HTTPS

  • SMTP TLS reporting

  • BIMI

    • Validates the SVG format and mark certificate

  • DNSSEC

Further reading

• Installation
• API
• CLI

Indices and tables

• Index

• Module Index

• Search Page