npm install && npm start  # http://localhost:3100

curl -X POST http://localhost:3100/validate \
  -H "Content-Type: application/json" \
  -d '{"email": "user@gmail.com"}'
# → {email, syntax, role, disposable, mx, domain, spf, dkim, typo, risk, deliverable}

curl -X POST http://localhost:3100/validate/batch \
  -H "Content-Type: application/json" \
  -d '{"emails": ["a@gmail.com", "b@fake.xyz"]}'
# → {total, valid, invalid, results}

curl -X POST http://localhost:3100/domain \
  -H "Content-Type: application/json" \
  -d '{"domain": "gmail.com"}'
# → {domain, exists, mx, spf, dkim, is_disposable, is_free_provider, reputation_score}

curl -X POST http://localhost:3100/suggest \
  -H "Content-Type: application/json" \
  -d '{"email": "user@gmial.com"}'
# → {original, has_suggestion, suggested: "user@gmail.com", reason}

curl -X POST http://localhost:3100/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'