checkdmarc

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

Sponcors

This is a project is maintained by one developer. Please consider sponsoring my work if you or your organization benefit from it.

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 mechanism
  • DMARC
    • Validation and parsing of DMARC records
    • Shows warnings when the DMARC record is made ineffective by sp values, or by use of the pct/rf/ri tags that were removed in RFC 9989
    • Checks for authorization records on reporting email addresses
  • BIMI
  • 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

Docker support

  1. Build the image using docker build . -t checkdmarc
  2. Use the image with a command like docker run --rm checkdmarc google.nl

Project links

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Latest release

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for Sean.Whalen from gravatar.com Sean.Whalen

Credits

Author: Sean Whalen

License expression

Apache-2.0
View SPDX License List

Requires

Python >=3.10

Provides Extra

build

Tags

BIMI DMARC DNS MTA-STS SPF

Classifiers

Report project as malware

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Source Distribution

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  • Download URL: checkdmarc-5.17.4.tar.gz
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  • Uploaded via: Hatch/1.17.1 {"ci":null,"cpu":"x86_64","distro":{"id":"resolute","libc":{"lib":"glibc","version":"2.43"},"name":"Ubuntu","version":"26.04"},"implementation":{"name":"CPython","version":"3.14.4"},"installer":{"name":"hatch","version":"1.17.1"},"openssl_version":"OpenSSL 3.5.5 27 Jan 2026","python":"3.14.4","system":{"name":"Linux","release":"7.0.0-28-generic"}} HTTPX2/2.9.1

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  • Download URL: checkdmarc-5.17.4-py3-none-any.whl
  • Upload date:
  • Size: 77.8 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? No
  • Uploaded via: Hatch/1.17.1 {"ci":null,"cpu":"x86_64","distro":{"id":"resolute","libc":{"lib":"glibc","version":"2.43"},"name":"Ubuntu","version":"26.04"},"implementation":{"name":"CPython","version":"3.14.4"},"installer":{"name":"hatch","version":"1.17.1"},"openssl_version":"OpenSSL 3.5.5 27 Jan 2026","python":"3.14.4","system":{"name":"Linux","release":"7.0.0-28-generic"}} HTTPX2/2.9.1

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Release history Release notifications | RSS feed

This release

5.17.4

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5.7.10 yanked

Reason this release was yanked:

A bug was introduced where subdomains used the base domains when wvaluating SPF a mechanisms

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