Как мне исправить этот код?

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<pre lang="HTML">
<div class="col-sm-6">
						<form id="request" class="row suscribe" action="request-form.php" method="post" accept-charset="utf-8">
							<div class="col-sm-12">
								<input type="text" class="form-control" placeholder="Name" name="name">
								<input type="email" class="form-control" placeholder="Email" name="email">
							</div>
							<div class="col-sm-12">
								<input type="number" class="form-control" placeholder="Phone" name="phone">
								<select class="form-control" name="program">
	                    			<option>Select Current Education</option>
	                    			<option>10th / 12th</option>
	                    			<option>Graduation</option>
	                    			<option>Post Graduation</option>
	                    			<option>CA / CS</option>
	                    			<option>Working Professional</option>
                                </select>
							</div>
							<div class="text-center">
								<button type="submit" class="btn btn-default text-center" > Request Course Information</button>
							</div>		
						</form>
					</div>

<?php


	$name        = $_POST['name'];
	$email       = $_POST['email'];
	$phone       = $_POST['phone'];
	$program     = $_POST['program'];

	$to="pkbansal991@gmail.com";
	$subject="New Enquiry";

	$body=" 
	    Message sent from website form\n	
		Name: $name\n
		Phone Number: $phone\n
		Email: $email\n	
		Program selection: $program
		";
	if($email=="") {
	echo "<div class='alert alert-danger'>
			  <a class='close' data-dismiss='alert'>×</a>
			  Warning! Please fill all the fields.
		  </div>";
	} else {
	mail($to,$subject,$body);
	echo "<div class='alert alert-success'>
			  <a class='close' data-dismiss='alert'></a>
			  Thank you for your message!
		  </div>";
	}
?>

Что я уже пробовал:

Перепробовал все возможные способы, найденные на Google и Youtube

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