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

Data verified by PyPI on Aug 17, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

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

GitHub Statistics

Data verified by PyPI on Aug 17, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

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

Download files

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Source Distribution

checkdmarc-5.17.5.tar.gz (66.8 kB view details)

Uploaded Source

Built Distribution

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checkdmarc-5.17.5-py3-none-any.whl (77.8 kB view details)

Uploaded Python 3

File details

Details for the file checkdmarc-5.17.5.tar.gz.

File metadata

  • Download URL: checkdmarc-5.17.5.tar.gz
  • Upload date:
  • Size: 66.8 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for checkdmarc-5.17.5.tar.gz
Algorithm Hash digest
SHA256 496ce85192673c140aee19aa3f134b6f50f579ac2a223e7b6bc054ce6643688a
MD5 feae36cc372e3ef4d4b705c37da89737
BLAKE2b-256 a212c13a5680688c6fee6ddd19a95cb7c6acc698f9021ec3c4e9005be13b17af

See more details on using hashes here.

Provenance

The following attestation bundles were made for checkdmarc-5.17.5.tar.gz:

Publisher: release.yml on domainaware/checkdmarc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file checkdmarc-5.17.5-py3-none-any.whl.

File metadata

  • Download URL: checkdmarc-5.17.5-py3-none-any.whl
  • Upload date:
  • Size: 77.8 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for checkdmarc-5.17.5-py3-none-any.whl
Algorithm Hash digest
SHA256 8e0945361005f71ae4f91a3b64460dfddd7eb4957b1a9514140fc1badcb6712c
MD5 8110b45f1372987d0d508c6ae216b6fa
BLAKE2b-256 2995738100f069c25ab56b3557b1abbbe5e195cdef7bf9dd83e9dbb1d0fcf717

See more details on using hashes here.

Provenance

The following attestation bundles were made for checkdmarc-5.17.5-py3-none-any.whl:

Publisher: release.yml on domainaware/checkdmarc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

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