Hey Thomas,
        
          Try this , It works for me.
         
      $config['page_title_prefix'] = "Thomas :: Network Observation and Monitoring";
$config['alerts']['email']['default'] = "tom@zit.com,anto@zit.com";
      $config['email_from'] = "Zitcom
        <observium@observium>";
        $config['email_backend'] = "sendmail";
        $config['email_smtp_host'] = 'localhost';
        $config['email_smtp_port'] = 25;
        $config['alerts']['email']['enable'] = TRUE;
        $config['alerts']['port']['ifdown'] = TRUE;
        // Port Bandwith
        $config['alerts']['port_util_alert'] = TRUE;
        $config['alerts']['port_util_perc'] = 85;
        
      
        
      
        
        
        Regards,
        Antony John,
         
      On 01/02/2014 05:31 PM, 
observium-request@observium.org wrote: