protected function _send()
	{
		$message = $this->build_message();
		$return_path = ($this->config['return_path'] !== false) ? $this->config['return_path'] : $this->config['from']['email'];
		if ( ! @mail(static::format_addresses($this->to), $this->subject, $message['body'], $message['header'], '-oi -f '.$return_path))
		{
			throw new \EmailSendingFailedException('Failed sending email');
		}
		return true;
	}