[exim] Condition in routers

I have created my own mailinglist program and now im in point of doing
bounce handling.
No big problems just wondering why this aint working:

maillist:
driver = dnslookup
domains = ! +local_domains
transport = maillist_smtp
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
condition = "${if match {$h_x-mailer:}{mailinglistprogram} {yes}{no}}"
no_more

that condition wont work. I have tried everyting.

-Juuso