checkdmarc

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

Sponsors

This 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
    • Optional STARTTLS and TLS testing (pass --check-mx-tls)
    • 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 Sep 4, 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 Sep 4, 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-6.0.1.tar.gz (96.8 kB view details)

Uploaded Source

Built Distribution

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checkdmarc-6.0.1-py3-none-any.whl (107.8 kB view details)

Uploaded Python 3

File details

Details for the file checkdmarc-6.0.1.tar.gz.

File metadata

  • Download URL: checkdmarc-6.0.1.tar.gz
  • Upload date:
  • Size: 96.8 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for checkdmarc-6.0.1.tar.gz
Algorithm Hash digest
SHA256 b9ca2007bbc3587cd05791e09b2607213815e949b526d5f2927894eaed4f32af
MD5 9e253c20956063d236da3c5256904476
BLAKE2b-256 8f314cb91fd6efe9e70487856a6daa19ce0c20387c3cbf357b0d66fb3e1e7143

See more details on using hashes here.

Provenance

The following attestation bundles were made for checkdmarc-6.0.1.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-6.0.1-py3-none-any.whl.

File metadata

  • Download URL: checkdmarc-6.0.1-py3-none-any.whl
  • Upload date:
  • Size: 107.8 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for checkdmarc-6.0.1-py3-none-any.whl
Algorithm Hash digest
SHA256 14bcbab1d069430644def9b9495e38cfb880ddd8725227eae21dcad9eeaadf85
MD5 07c55edd97b719b760125f5a47518b8a
BLAKE2b-256 a38104a874eee0055155d6a2444e3eb9b71e93693251655a1cb59ffcd191b4b1

See more details on using hashes here.

Provenance

The following attestation bundles were made for checkdmarc-6.0.1-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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