[Exim] jolly-pipe address

I need to receive a serioes of messages addressed at:
AUTLAB-yyyyyy-zzzzzzzzzzzz@???
(All the program need is the yyyyyy-zzzzzzzzzzz and the
from: field)
I thought to set this way:

# TRANSPORT:
autlab_transport:
driver = pipe
command = "/usr/local/sbin/program $local_part $from_address"
user = www-data
group = www-data
# DIRECTORS:
autlab_dir:
driver = smartuser
prefix = autlab-
transport = autlab-transport

Is it ok ???
Leonardo Boselli (NIT)
Dipartimento Ingegneria Civile
Universita` di Firenze
Via Santa Marta 3
I-50139 Firenze
+39()055-4796-431