# Check a single domain
python src/deliverability_checker.py example.com

# Verbose output with full record details
python src/deliverability_checker.py example.com --verbose

# Check with a specific DKIM selector
python src/deliverability_checker.py example.com --dkim-selector google

# Check multiple domains from a file
python src/deliverability_checker.py --domains examples/sample_domains.txt --output report.json

{
  "domain": "example.com",
  "score": 85,
  "spf": {
    "found": true,
    "record": "v=spf1 include:_spf.google.com ~all",
    "valid": true,
    "issues": []
  },
  "dmarc": {
    "found": true,
    "policy": "reject",
    "alignment": "strict"
  },
  "dkim": {
    "found": true,
    "selector": "google",
    "key_size": 2048
  },
  "mx": {
    "found": true,
    "records": ["mx1.example.com", "mx2.example.com"]
  },
  "checked_at": "2026-03-14T12:00:00+00:00"
}