[Exim] Where is the problem in filter file?

Hi

Where is the error in this filter?

==========
# Exim filter
if $header_from: ends "dailydirt.com"
then
    save /dev/null
endif
==========

Exim says:
missing or malformed local part (expected word or "<" ) in @if $header_from: ends "dailydirt.com""

Exim version 2.11

--
                    Denis Chapligin