How to make a qmail hub relay ?

I search in archive's list but I didn't find how to make a qmail hub relay. Anybody can elp me how to makea hub. I want my qmail server to receive mail for a lot domain (know domain :) ) and to redirect to different mail server (foreign mail server). Thx for your help.

ISP

Hi all, I'm a small ISP (2500 mailbox). I want to install qmail. I'm looking for information about BSMTP (hosting mail domain and deliver mail to dialup server). Where can I find information (example/configuration) ? Thx :)