Features

This chapter covers the core features and capabilities of DKIM Validator.

Features

• DNS record checking — Validates DKIM TXT records for any domain + selector
• Multi-selector scanning — Probes 15 common selectors (Google, Microsoft 365, Mandrill, etc.)
• DKIM header parsing — Extracts and explains all tags from DKIM-Signature headers
• DNS record template generation — Creates ready-to-paste TXT records for new domains
• Key size validation — Warns on weak keys (< 1024 bits)
• Tag descriptions — Human-readable explanations of every DKIM tag (v, a, b, bh, c, d, h, s, etc.)
• JSON output — Machine-readable results for CI/CD integration

Requirements

• Python 3.10+
• No external dependencies (stdlib only)

Quick Start

Follow this guide to get DKIM Validator up and running in your environment.

Quick Start

# Check DKIM for a domain with default selector
python src/dkim_validator.py check example.com

# Check with a specific selector
python src/dkim_validator.py check example.com --selector google

# Scan for all DKIM selectors on a domain
python src/dkim_validator.py scan example.com

# Generate a DKIM DNS record template
python src/dkim_validator.py generate --domain example.com --selector default

# Parse a DKIM-Signature header from an email
python src/dkim_validator.py parse-header --file examples/sample_dkim_header.txt

Common Selectors Scanned

The scan command checks these selectors automatically: