title: How to get portal preferences setting on Liferay
body: <p>I am a Liferay user, I need to get some of properties in my liferay portal, such as : Name, Virtual Host, Mail Domain, etc...(control panel/portal setting), in my code, is there any api to do this ?
  (control panel/portal setting)</p>
  
  <p>I had tried with PortalPreferences, but still dont know how to get it at all.</p>
  
  <p>Please help!.</p>
  
  <p>Thanks advance.</p>
  
  <p>(Liferay portal 6.0.6)</p>