[Exim] all mails in one pipe

Hi,

if I transport mails with the following config to uucp, I get 1 uucp
package for 1 mail. Exim closes the pipe after every mail. How can I
prevent this?

#v+
rbsmtp:
driver = pipe
bsmtp = all
bsmtp_helo
batch = all
batch_max = 200
current_directory = /tmp
prefix =
suffix =
command = /usr/bin/bzip2 -cz | /usr/bin/uux - -g A -r $host!rbsmtp
use_shell
log_output
freeze_exec_fail
user = mail
group = mail
#v-

Joerg.