[Exim] Problem with condition

Hi,

(Exim 4.22 on FreeBSD 4-Stable, from Ports, with exiscan-acl)

i have a problem with a condition in an router.

I want to disable the router if a certain word is part of the subject
and try to use this condition:

condition = ${if match
{$h_subject:}{\N^Filialvernetzungsbenachrichtigung\N}{no}{yes}}

(in the configure file it is on one line)

But it doesn't work. A mail with "Filialvernetzungsbenachrichtigung" in
the subject goes through the router (also mails with
"Filialvernetzungsbenachrichtigung von xxx").

What is wrong with this?

Ciao,
Jochen