How do I send an email from gmail within my app? - php

Question

I have the following code. I would like to send a confirmation email to the user as soon as they click the 'register' button. When I click on the register button my database gets updated with the correct information but it doesn't send the email.
Email.php:
<?php
include('class.phpmailer.php');
include('class.smtp.php');
$mail = new PHPMailer();
$mail->IsSMTP();
//GMAIL config
$mail->SMTPAuth = true; // enable SMTP authentication
$mail->SMTPSecure = 'ssl'; // sets the prefix to the server
$mail->Host = 'smtp.gmail.com'; // sets GMAIL as the SMTP server
$mail->Port = 465; // set the SMTP port for the GMAIL server
$mail->Username = 'xxx#gmail.com'; // GMAIL username
$mail->Password = 'yyy'; // GMAIL password
//End Gmail
$mail->From = 'xxx#gmail.com';
$mail->FromName = 'SYS';
$mail->Subject = 'Registration Successful';
$mail->MsgHTML('You have successfully been added to the System!');
$mail->AddAddress($_POST['EmailAddress']);
$mail->IsHTML(true); // send as HTML
if(!$mail->Send()) {//to see if we return a message or a value bolean
echo "Mailer Error: " . $mail->ErrorInfo;
} else echo "Message sent!";
?>
This is the part of the code where I get the email address from. I have it so that the user inputs his email address into the textbox. it gets saved as EmailAddress
AddUser.php:
<div class="">
<label style=""> Email Address </label>
<input id="Email Address" type="email" name="EmailAddress" value="">
</div>
My sql query goes here. I include the Email.php file after it.
<?php
.
.
.
include('./content/Email.php');
?>
This is my button. When the user clicks it, the information gets stored and is supposed to send the email.
</select></div>
</div>
</div>
<br><br>
<input type="submit" class="btn btn-submit" value="Add User">
</div>