array(1) {
  [0]=>
  array(3) {
    ["message"]=>
    string(33) "Does not contain a valid address."
    ["field"]=>
    string(29) "personalizations.0.to.0.email"
    ["help"]=>
    string(94) "http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.personalizations.to"
  }
}