Thanks for the quick response!
I had already installed the usermanager/mailsorting contribs hoping they would do the trick. From what I can tell, it only looks at the email address, header, subject, or the size, not the actual email body.
I think configuring the individual .qmail files seems like it's too late since I'm looking to examine the emails as they come in.
For example, ideally I'm looking for something like our maillog that examines all emails for "projectx" and forwards them all to a "projectx" user, regardless for who sent it. Can the contribs and/or .qmail files do that or do I need something else?
Thanks in advance.