Verify single email address

Example response

{
  "email": {
    "alternateEmail": "alternate@example.com",
    "deliverable": "true",
    "emailAddress": "example@example.com",
    "provider": "gmail",
    "risk": {
      "isFreeProvider": true,
      "isPrimaryDomain": true
    },
    "secureGatewayProvider": "Proofpoint",
    "syntax": {
      "domain": "example.com",
      "isValid": true,
      "user": "example"
    }
  },
  "requestId": "1234567890abcdef",
  "status": "success"
}