if (isset($_POST['mail_at'])) {
$mail = new PHPMailer(true);
try {
$mail->isSMTP();
$mail->Host = 'smtp.gmail.com';
$mail->SMTPAuth = true;
$mail->Username = '@gmail.com';
$mail->Password = ''; //
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
$mail->Port = 587;