[Exim] exim - cyrus deliver

Hi,

I am trying to use cyrus to deliver messages in a .forward
file. My .forward file looks like this:
# Exim filter

if $header_subject: contains "cyrus"
then
        pipe  "/usr/cyrus/bin/deliver -m bob -a cyrus"
else
        deliver bob@???
endif

Error Message:
A message that you sent could not be delivered to one or more
of its
recipients. This is a permanent error. The following
address(es) failed:

  pipe to |/usr/cyrus/bin/deliver -m bob -a cyrus
    generated by bob@???
    Child process of address_pipe transport returned 75 (could
mean temporary error) from command:
    /usr/cyrus/bin/deliver

The following text was generated during the delivery attempt:

------ |/usr/cyrus/bin/deliver -m bob -a cyrus ------

couldn't connect to lmtpd: Transport endpoint is not connected

421 4.3.0 deliver: couldn't connect to lmtpd

can you please help!