Sending Mail Using PHP with PHPMailer

<?php
require_once 'autoload.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

$host = "smtp.websitelive.net";
$port = 587;
$username = "you@your-email-here.com";
$password = "YourPasswordHere";

$from = "you@your-email-here.com";
$to = "to@to-email-here.com";
$replyto = "reply-to@your-email-here.com";

$subject = "Hi!";
$body = "Hi,\n\n Test from my website";

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host = $host;
    $mail->Port = $port;
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    $mail->SMTPAuth = true;
    $mail->Username = $username;
    $mail->Password = $password;

    $mail->setFrom($from);
    $mail->addAddress($to);
    $mail->addReplyTo($replyto);
    $mail->Subject = $subject;
    $mail->Body = $body;
    $mail->isHTML(false); // set to true if sending HTML email

    $mail->send();
    echo "<p>Message successfully sent!</p>";

} catch (Exception $e) {
     echo "<p>There was an error!</p>";
     echo "<p>" . $mail->ErrorInfo . "</p>";
}
?>