Mailing

<?php
require 'phpMailer/PHPMailerAutoload.php';
require 'connection.php';

$name = $_POST['name'];
$email = $_POST['email'];
$group = $_POST['group'];
$exists = false;

// Agregarlo a la Base de Datos
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    echo "Error";
    exit;
}

// Checar que no este registrado
$query = mysqli_query($conn, "SELECT * FROM asistentes WHERE Correo='".$email."'");

if(mysqli_num_rows($query) > 0){
    $exists = true;
}

if(!$exists) {
    $sql = "INSERT INTO asistentes (Nombre, Correo, Semestre)
    VALUES ('$name', '$email', '$group')";

    if ($conn->query($sql) === FALSE) {
        echo "Error";
        exit;
    }

    $conn->close();

    $mail = new PHPMailer;
    //$mail->SMTPDebug = 3;                               // Enable verbose debug output

    $mail->isSMTP();                                      // Set mailer to use SMTP
    $mail->Host = 'xxx';                // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;                               // Enable SMTP authentication
    $mail->Username = 'xxx';                 // SMTP username
    $mail->Password = 'xxx';                           // SMTP password
    $mail->SMTPSecure = 'tsl';                            // Enable TLS encryption, `ssl` also accepted
    $mail->Port = 25;                                    // TCP port to connect to

    $mail->From = 'xxx';
    $mail->FromName = 'Taller de Desarrollo de Aplicaciones Web';
    $mail->addAddress($email, $name);     // Add a recipient
    //$mail->addAddress('ellen@example.com');               // Name is optional
    //$mail->addReplyTo('info@example.com', 'Information');
    $mail->addBCC('xxx');           // Copia Invisible para Liz
    $mail->addBCC('xxx');       // Copia Invisible para mi

    //$mail->addAttachment('/var/tmp/file.tar.gz');         // Add attachments
    //$mail->addAttachment('/tmp/image.jpg', 'new.jpg');    // Optional name
    $mail->isHTML(true);                                  // Set email format to HTML

    $mail->Subject = 'Bienvenido/a al Taller Desarrollo de Aplicaciones Web ';
    $myBody = file_get_contents('email.html');
    $exploded = explode(" ", $name);
    $firstName = $exploded[0];
    $myBody = str_replace("{labelNombre}", $firstName, $myBody);
    $mail->Body = $myBody;
    //$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

    if(!$mail->send()) {
        echo 'Error.';
        exit;
    }
    echo 'Success';
} else {
    echo "Duplication";
}