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 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 Sep 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-6.0.2.tar.gz (103.2 kB view details)

Uploaded Source

Built Distribution

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checkdmarc-6.0.2-py3-none-any.whl (114.8 kB view details)

Uploaded Python 3

File details

Details for the file checkdmarc-6.0.2.tar.gz.

File metadata

  • Download URL: checkdmarc-6.0.2.tar.gz
  • Upload date:
  • Size: 103.2 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for checkdmarc-6.0.2.tar.gz
Algorithm Hash digest
SHA256 652e56dec66bda5ecf71bf018b412f41830ca21a37bd6d0fc296a0be02c99c8b
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BLAKE2b-256 5253e12e507a05a3bf2a2e35d7a7d5957db32dc45e3f0df85b057401248a4b63

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Provenance

The following attestation bundles were made for checkdmarc-6.0.2.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-6.0.2-py3-none-any.whl.

File metadata

  • Download URL: checkdmarc-6.0.2-py3-none-any.whl
  • Upload date:
  • Size: 114.8 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for checkdmarc-6.0.2-py3-none-any.whl
Algorithm Hash digest
SHA256 d7cb5de290dd0d57f0a59b3571223f8db7de0fe6c3708114de7da17068b01fa9
MD5 989d793e600d42493b39b6b7a1f5c26e
BLAKE2b-256 b0b5f0d17e0c3316cc26a525695f6ed1bae44eb86c2b367765007bc6dabf3874

See more details on using hashes here.

Provenance

The following attestation bundles were made for checkdmarc-6.0.2-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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