Forward Messages to a secondary Mail Server

[Jeff Russell, AIT]

Hi everyone!   This is a question regarding forwarding mail to a secondary server.  We need to forward email on a per user email basis.  Is there a way that when qmail receives email, and does not find that specific address for the user, to direct it to another specified email server.   Anyone that has done this before, please respond.   Thanks in advance.   Salu Jeff