Changed README with updated setup information.
Changed README with updated setup information.

runk/dockermail,dopry/dockermail,n00dl3/dockermail,lava/dockermail,dopry/dockermail,n00dl3/dockermail,runk/dockermail,htmlgraphic/Mail-Server,huncode/dockermail,huncode/dockermail,Kiina/dockermail,htmlgraphic/Mail-Server,Kiina/dockermail,lava/dockermail