checkdmarc
A Python module and command line parser for SPF and DMARC records
Decision gist · record as of 2026-08-14
Yes. The package is actively maintained, has no known vulnerabilities, installs with low friction, and solves a specific and important problem in email security. It is suitable for security teams, domain administrators, and developers building email infrastructure tools. The Apache-2.0 license poses no restriction.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later; DNS queries depend on network connectivity and nameserver availability.
- Low friction: pure Python wheel with 10 runtime dependencies including well-established libraries like cryptography, dnspython, and requests.
- Actively maintained with a release 17 days old and last commit on 2026-07-28.
License · maintenance · safety
Apache-2.0 (permissive) — Apache-2.0 permissive license allows commercial and private use with minimal restrictions; suitable for most deployment scenarios.
last release 2026-07-28 (17 days) · last repo commit 2026-07-28 · 318 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 135,420 downloads/mo, #11,432 on PyPI
Alternatives
Verify before relying
pip install checkdmarc
from checkdmarc import check_domain
result = check_domain('example.com')
print(result['dmarc']['record'])- Whether the package handles internationalized domain names (IDNs) correctly in all validation modes.
- Performance characteristics when checking large batches of domains or deeply nested SPF includes.
- Whether DNSSEC validation failures are treated as hard errors or warnings in programmatic use.
What it is and what it does
checkdmarc is a Python library and command-line tool for validating email authentication infrastructure. It checks SPF records for DNS lookup efficiency and mechanism correctness, validates DMARC policies against RFC standards, verifies BIMI mark certificates against security requirements, and inspects MTA-STS and SMTP TLS reporting policies. It also reports on MX record configuration, nameserver setup, and SOA records.
The package provides three interfaces: a Python API for programmatic use, a CLI that outputs results in JSON or CSV format, and support for batch checking of multiple domains. It includes DNSSEC validation and checks for common misconfigurations like ineffective DMARC `sp` values or deprecated RFC 9989 tags. Most users will reach for it to audit domain email security posture or integrate email authentication checks into security workflows.
Use it for
- Audit a domain's SPF record for DNS lookup efficiency and validate mechanism syntax before deployment.
- Check DMARC policy compliance and detect configurations that may be ineffective due to `sp` or deprecated tags.
- Validate BIMI mark certificates against Minimum Security Requirements before issuance or renewal.
- Batch-check multiple domains' email authentication records and export results as JSON or CSV for reporting.
- Integrate email authentication validation into a security scanning or compliance tool via the Python API.
- Verify MTA-STS and SMTP TLS reporting policies are correctly configured on a domain.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is actively maintained, has no known vulnerabilities, installs with low friction, and solves a specific and important problem in email security. It is suitable for security teams, domain administrators, and developers building email infrastructure tools. The Apache-2.0 license poses no restriction.
Install
checkdmarc on PyPI
Before you install
Low friction: pure Python wheel with 10 runtime dependencies including well-established libraries like cryptography, dnspython, and requests. Actively maintained with a release 17 days old and last commit on 2026-07-28.
Requires Python 3.10 or later; DNS queries depend on network connectivity and nameserver availability.
License in practice
Apache-2.0 permissive license allows commercial and private use with minimal restrictions; suitable for most deployment scenarios.
Quickstart
pip install checkdmarc
from checkdmarc import check_domain
result = check_domain('example.com')
print(result['dmarc']['record'])Verify before relying
- Whether the package handles internationalized domain names (IDNs) correctly in all validation modes.
- Performance characteristics when checking large batches of domains or deeply nested SPF includes.
- Whether DNSSEC validation failures are treated as hard errors or warnings in programmatic use.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 10 packagescryptographydnspythonexpiringdictimportlib-resourcespempublicsuffixlistpyleripyopensslrequestsxmltodict |
| Maintenance | Actively maintained 17 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 135,420 / month, #11,432 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: Apache Software LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: Communications :: EmailTopic :: Security |
Evidence: checkdmarc-5.17.4-py3-none-any.whl
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See also authheaders · parsedmarc · email-validator · certbot-dns-cloudflare · pyIsEmail · aws-cdk.aws-certificatemanager · validate_email · certbot-dns-directadmin · certbot-dns-duckdns · certbot-dns-route53