[Exim] Length limit of filter.

Is there a limit to the lenght of "or" in a filter?

I do a

if       $h_X-Sender: contains "liz@???" or
        $h_X-Sender: contains "tjackson@???" or
    ...
        $h_X-Sender: contains "mahirsch@???"

then
    ...
endif

And the last term always seem to get "ignored"?

Ok, i could use a lookup.. But is there infact a limit?