DMARC (Domain-based Message Authentication, Reporting & Conformance)

DMARC email authentication module implemented in Python.

Installation

Use the package manager pip to install dmarc.

$ pip install dmarc

Usage

>>> from dmarc import SPFAuthResult, DKIMAuthResult, SPFResult, DKIMResult, DMARCPolicy
>>> # Represent verified SPF and DKIM identifiers
>>> spf = SPFAuthResult('news.example.com', SPFResult('pass'))
>>> dkim = DKIMAuthResult('example.com', DKIMResult('pass'))
>>> policy = DMARCPolicy(record='v=DMARC1; p=reject;', domain='example.com')
>>> policy.verify(auth_results=[spf, dkim])
>>> 
>>> # RR resolver example
>>> from dmarc.resolver import resolve, RecordNotFoundError, RecordMultiFoundError
>>> from dmarc.psl import get_public_suffix
>>> domain = 'news.example.com'
>>> try:
...     record = resolve(domain)
... except (RecordNotFoundError, RecordMultiFoundError):
...     org_domain = get_public_suffix(domain)
...     if org_domain != domain:
...         record = resolve(org_domain)
... 
>>> # Aggregate report xml document to dict example
>>> from dmarc.report import DMARCRelaxedSchema
>>> from dmarc.tests.report.test_report import TEST_XML_DOCUMENT
>>> adict = DMARCRelaxedSchema.to_dict(TEST_XML_DOCUMENT)
>>> 

Milter configuration with Postfix

1. Start dmarc.milter module or run via Systemd — see contrib/.
2. Start a Postfix instance with a configuration like smtpd_milters = inet:127.0.0.1:9000

Described here 👉 Run DMARC Milter with Postfix.

License

MIT