# checkdmarc
[](https://github.com/domainaware/checkdmarc/actions/workflows/python-tests.yaml)
[](https://pypi.org/project/checkdmarc/)
[](https://pypistats.org/packages/checkdmarc)
A Python module, command line utility, and [web application](https://github.com/domainaware/checkdmarc-web-frontend) for validating SPF and DMARC DNS records.
## 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 `pct` or `sp` values
- Checks for authorization records on reporting email addresses
- BIMI
- Validation of the mark format and certificate
- Parsing of the mark certificate
- 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`
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