Send mail from contact form with PHPmailer & Mailgun very easy

PHPMailer and mailgun

// FIRST CREATE A FREE MAILGUN ACCOUNT HERE https://www.mailgun.com/
// html contact form example

<form action="mail.php" method="post">
	<h5>name</h5>
	<input type="text" name="name">
	<h5>email address</h5>
	<input type="text" name="email">
	<h5>message</h5>
	<textarea name="message"></textarea>
	<input type="submit" name="submit" value="submit">
</form>

// mail.php file
// dont forget to download composer here https://getcomposer.org/download/ and phpmailer here https://github.com/PHPMailer/PHPMailer

<?php
require 'vendor/autoload.php';

$mail = new PHPMailer;

if(isset($_POST['submit'])){
    $name = $_POST['name'];
    $email = $_POST['email'];
    $message = $_POST['message'];
    $mail->isSMTP();                                      // Set mailer to use SMTP
    $mail->Host = 'smtp.mailgun.org';  // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;                               // Enable SMTP authentication
    $mail->Username = 'MAILGUN USERNAME';                 // SMTP username
    $mail->Password = 'MAILGUN PASSWORD';                           // SMTP password
    $mail->SMTPSecure = 'ssl';                            // Enable TLS encryption, `ssl` also accepted
    $mail->Port = 465;                                    // TCP port to connect to

    $mail->setFrom( $email , $name );
    $mail->addAddress('[email protected]', 'Chinedu Abalogu');     // Add a recipient
    $mail->isHTML(true);                                  // Set email format to HTML

    $mail->Subject = 'Someone has something to say about xxxx';
    $mail->Body    = $message;
    $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

    if(!$mail->send()) {
        header("Location: /error.html");
    } else {
        header("Location: /thankyou.html");
    }
}

?>

i am a programmer please i hope code to run sucessfully