[exim] Another system filter question!

Hi,

I have this in my system filters

if $message_headers matches
"(207.126.144|207.126.145|207.126.146|207.126.147|207.126.148|207.126.14
9|207.126.150|207.126.151|207.126.152|207.126.153|207.126.154|207.126.14
7)"
then

and was wondering if I can put the "(207.126......" section into a text
file?

I've tried

If $message_headers matches /etc/exim/test/testfile
Then

But this doesn't work. Any ideas?


Thanks

Gareth