[Exim] /etc/aliases pipe failure with rt(request-tracker)

Hi,

I have Exim running as the standard Debian Install from stable tree. not
sure what version. I have installed request-tracker which required a
pipe in /etc/aliases such as this

support : "|/usr/local/rt2/bin/rt-mailgate --queue support --action
correspond"
support-comment : "|/usr/local/rt2/bin/rt-mailgate --queue support
--action comment"

this is my exim.conf (relative bits)

system_aliases:
driver = aliasfile
file_transport = address_file
pipe_transport = address_pipe
file = /etc/aliases
search_type = lsearch
# user = list


when I sent a test email to support@??? with mail was bounced and
the following message sent to root at the mailserver
---message---
2003-02-05 23:53:01 18gak7-0001AS-00 Neither the system_aliases director
nor the address_pipe transport
set a uid for local delivery of |/usr/local/rt2/bin/rt-mailgate --queue
support --action correspond
---end message----
i then set the above commented out user line to

system_aliases:
driver = aliasfile
file_transport = address_file
pipe_transport = address_pipe
file = /etc/aliases
search_type = lsearch
user = support

but when I try that I get an "SMTP geetings failure exim configuration
error" error in pine,
even though I could stop and start exim using /etc/init.d/exim without
error....
now, a mail sent to support@??? into cyberspace. no
return, and no delivery.

any ideas anyone ?

thanks

richard

"great spirits have always encountered violent opposition from mediocre
minds"
Albert Einstein