First request

Authorization: Bearer rb_key_<token>

curl -X POST https://api.tryrelaybase.com/v1/email/single-validate \
  -H "Authorization: Bearer rb_key_<token>" \
  -H "Accept: application/json" \
  -d '{"email": "user@example.com"}'

{
  "data": {
    "catch_all": false,
    "is_disposable": false,
    "is_free": true,
    "is_role_based": false,
    "is_valid": true,
    "mx_valid": true,
    "reason": "Mailbox verified via SMTP",
    "result": "jane@company.com",
    "score": 85,
    "smtp_code": 250,
    "status": "valid",
    "suggestion": "Email appears fully deliverable",
    "syntax_valid": true
  },
  "message": "result",
  "status": 200,
  "success": true
}