在PHP联系人表单中配置SMTP

Question

我正在使用引导主题，该主题带有我的投资组合的PHP联系人表格。当我在旧的虚拟主机上使用它时，它没有问题。但是，由于我现在正在使用Siteground，因此邮件延迟到达我的收件箱，有时甚至根本没有。

根据Siteground，我必须在联系表单中使用SMTP，但是我不知道该如何使用。 你能帮我吗？       

  //Removed empty($_POST['phone']) ||

  $name = strip_tags(htmlspecialchars($_POST['name']));
  $email = strip_tags(htmlspecialchars($_POST['email']));
  //$phone = strip_tags(htmlspecialchars($_POST['phone']));
  $message = strip_tags(htmlspecialchars($_POST['message']));

  // Create the email and send the message
  $to = "benibargera@gmail.com"; // Add your email address inbetween the "" replacing yourname@yourdomain.com - This is where the form will send a message to.
  $subject = "Website Contact Form:  $name";
  $body = "You have received a new message from your website contact form.\n\n"."Here are the details:\n\nName: $name\n\nEmail: $email\n\nPhone: $phone\n\nMessage:\n$message";
  $header = "From: my@email.com\n"; // This is the email address the generated message will be from. We recommend using something like noreply@yourdomain.com.
  $header .= "Reply-To: $email";

  if(!mail($to, $subject, $body, $header))
    http_response_code(500);
  ?>