SendGrid-电子邮件未发送/ PHP

Question

我正在尝试通过SendGrid，以便通过我的网站上的联系方式发送电子邮件。我的代码没有抛出任何错误，但是电子邮件仍未传递。没有产生202状态码，因此结果返回为假

请，外面的PHP专家可以快速浏览一下，看看我在哪里出错。因为我没有收到任何错误，所以我完全迷路了！

require("sendgrid-php/sendgrid-php.php");

  if (isset($_POST['submit'])) {

    $name = $_POST['name'];
    $email = $_POST['email'];
    $phone = $_POST['phone'];
    $company = $_POST['company'];
    $message = $_POST['message'];

    $FROM_EMAIL = 'test@test.com';
    $TO_EMAIL = 'test@test.com';


    $subject = "Contact Form";
    $from = new SendGrid\Email(null, $FROM_EMAIL);
    $to = new SendGrid\Email(null, $TO_EMAIL);
    $content = new SendGrid\Content("text/plain",$name, $email, $phone, $company, $message);
    $mail = new SendGrid\Mail($subject, $from, $to, $content);
    $sendgrid = new \SendGrid(getenv('API-KEY'));

    $response = $sendgrid->client->mail()->send()->post($mail);

    if ($response->statusCode() == 202) {
    // Successfully sent
      echo 'done';
    } else {
      echo 'false';
    }

  }