[Exim] alias files and exim 4.10

hi,

i have trouble migrating from exim 3 to exim 4 using alias file expansion.

in v3 the following worked fine:

--- exim.cfg ---
virtual:
driver = aliasfile
file_transport = address_file
pipe_transport = address_pipe
file = /etc/exim/lib/$domain
search_type = lsearch*
expand = true
qualify_preserve_domain = true
---

with an alias file like

--- testdomain.de ---
info : ausername
* : ${local_part}@???
---

expanding ${local_part} doesn't seem to be possible any more in v4. any chance
to apply something like this with v4?

regards, --- jan.