public function getPlainText(){
		if( !$this->response )
			throw new RuntimeException( 'No conversion startet' );
		$cacheKey	= 'premailer_'.$this->response->requestId.'.text';
		if( $this->cache && $this->cache->has( $cacheKey ) )
			return $this->cache->get( $cacheKey );
		$text	= Net_Reader::readUrl( $this->response->documents->txt );
		$this->cache && $this->cache->set( $cacheKey, $text );
		return $text;
	}