private function smtpSend()
{
$smtp = new Smtp();
try {
$smtp->open($this->hostname, $this->port, $this->timeout);
$smtp->hello($this->hello);
$smtp->auth($this->user, $this->pwd);
$smtp->from($this->from);
$smtp->to($this->to);
$smtp->data($this->subject, $this->message);
$smtp->quit();
$smtp->close();
} catch (Exception $e) {
throw new Exception($e);
}
}