private function validarHeaders($headers,$destination)
	{
		foreach ($headers as $key => $header)
		{
			if(!in_array($key, $this->headers))
			{
				unset($headers[$key]);
			}
			else
			{
				$headers[$key] = "$key:$header";
			}
		}
		if(count($headers)>0)
		{
			$headers['To'] = $destination;
			array_unshift($headers, "MIME-Version: 1.0","X-Priority: 1");
			array_push($headers, "X-Mailer: PHP/".phpversion());
		}
		return implode("\r\n", $headers);
	}