[exim] how do i filter against utf-8 headers

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Συντάκτης: abc
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Προς: exim-users
Καινούρια Θέματα: Re: [exim] naïvely filtering against utf-8 headers
Αντικείμενο: [exim] how do i filter against utf-8 headers
I noticed that the majority of the spam that my mail server receives has a
subject that is UTF-8 Encoded. I want to deny ALL emails whose Subject
line contains a UTF-8 encoded stuff.

I tried this, but it does not work:

   deny    hosts = +rbl_hosts
           message = UTF-8 not allowed
           log_message = UTF-8 not allowed in subject: $h_subject
           condition = ${if match\
           {${lc:$h_subject:}}\
           {\Nutf\-8\N}\
           {yes}{no}}


That does not successfully match a UTF-8 encoded subject line.

What's interesting, is if I look at a spam email within my mail reader
(Pine), it looks like this: Subject: [utf-8] Hi again

But the actual text within the /var/spool/mail file actually looks like
this: Subject: =?utf-8?B?SGkgYWdhaW4=?=

So there's some kind of encoding magic happening here that may be making
it difficult for me to filter against UTF-8 messages. Any suggestions?