code: public function setHTML($message) {
  		$f3 = \Base::instance();
  		// we need a clean template instance for extending it one-time
  		$tmpl = new \Template();
  		// create traceable jump links
  		if ($f3->exists('mailer.jumplinks',$jumplink) && $jumplink)
  			$tmpl->extend('a', function($node) use($f3, $tmpl) {
  				if (isset($node['@attrib'])) {
  					$attr = $node['@attrib'];
  					unset($node['@attrib']);
  				} else
  					$attr = array();
  				if (isset($attr['href'])) {
  					if (!$f3->exists('mailer.jump_route',$ping_route))
  						$ping_route = '/mailer-jump';
  					$attr['href'] = $f3->get('SCHEME').'://'.$f3->get('HOST').$f3->get('BASE').
  						$ping_route.'?target='.urlencode($attr['href']);
  				}
  				$params = '';
  				foreach ($attr as $key => $value)
  					$params.=' '.$key.'="'.$value.'"';
  				return '<a'.$params.'>'.$tmpl->build($node).'</a>';
  			});
  		$message = $tmpl->build($tmpl->parse($message));
  		$this->setContent($message,'text/html');
  	}
docs: set message in HTML text format
  @param $message