Alias Problem

Has anyone else ran into a problem with aliasing.  I've not really tried to
mess with it for a long time but I realized very quickly with this recent
change over that I've made that apparently aliasing doesn't work.

I've looked through the router config and it appears that there is no router
for e-mail aliases.  Does anyone have this code from older versions or
laying around anywhere?  I've looked in the vexim source all the way back to
1.5 and can't seem to find code which determines how aliased addresses
should be handled.  Catchall works just fine.

This is what mainlog in exim4 shows.

2009-03-08 23:02:10 1LgWgl-00066S-PH ** [email protected]: Unrouteable
address

Any help would be appreciated.  Thanks!

~Torry