[Exim] Configuration error for message_fillter

Successfully tested my filter file with
sendmail -bf myfilter. It worked fine.

The my filter file as follow:

# exim filter
if $header_to: contain "abc.com" then
save /export/home/philipk/archive_folder
unseen deliver philip_khuu@???

endif

finish

After successfully test on command line, I implemented this filter into
/etc/exim.conf
at Directors Configuration section as message_filter = /usr/exim/myfilter. I then
kill -HUP
exim or restart exim. The paniclog file indicated message_filter as unknown.

Here's error:

2001-01-09 12:46:28 Exim configuration error
option "message_filter" unknown in line 310

Can someone tells me what have I done wrong?

Thank.

Here's the configuration file.

######################################################################
#                      DIRECTORS CONFIGURATION                       #
#             Specifies how local addresses are handled              #
######################################################################

userforward:
driver = forwardfile
file = .forward
no_verify
no_expn
check_ancestor
file_transport = address_file
pipe_transport = address_pipe
reply_transport = address_reply
filter
message_filter = /usr/exim/myfilter






# exim filter

2001-01-09 12:46:28 Exim configuration error
option "message_filter" unknown in line 310















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