About hierarchy DOMAIN ???

[Pichit Jiw]

Hi all,   I am a newbie. I use qmail+vpopmail (mysql )+sqwebmail. I know sqwebmail support about hierarchy user (when user over 100 up) which is so good :D . But I would like to know Sqwebmail support hierarchy virtual domain (when there are many domains 500 up) and if Sqwebmail supported , I would like to know how to use it. Please help me.   Best Regards, Pichit