spamassassin & exim & virtual users : R=spamcheck_router T=spamcheck defer (-24): Filter process failure

Hi All,

I have exim running with mysql database for virtual users.
when i enable spamassassin, i get the following error messages and mail is
not delivered :-

R=spamcheck_router T=spamcheck defer (-24): Filter process failure

i have the following in my exim.conf file :-

under routers config i have :

spamcheck_router:
no_verify
# check_local_user
# When to scan a message :
# - it isn't already flagged as spam
# - it isn't already scanned
condition = "${if and { {!def:h_X-Spam-Flag:} {!eq
{$received_protocol}{spam-scanned}}} {1}{0}}"
driver = accept
transport = spamcheck


under transport i have :

spamcheck:
driver = pipe
command = /usr/sbin/exim -oMr spam-scanned -bS
use_bsmtp = true
transport_filter = /usr/bin/spamc
home_directory = "/tmp"
current_directory = "/tmp"
# must use a privileged user to set $received_protocol on the way back
in!
user = exim
group = exim
log_output = true
return_fail_output = true
return_path_add = false
message_prefix =
message_suffix =



any ideas ? any help appreciated !!