I just noticed that when I get (or test) a mail which have linebreaks in
the subject, exim filter fails on detecting content and behaves strangely.
(This happens usually in spams...)
Here are two samples of such mails
http://www.huweb.hu/v/exim/samplemail1.txt and
http://www.huweb.hu/v/exim/samplemail2.txt
Fiter result files narrowed down to the problem, with comments:
http://www.huweb.hu/v/exim/sample1.txt
http://www.huweb.hu/v/exim/sample2.txt
If you have any questions, comments, etc, don't hesitate to contact me.
G.