[Mimedefang] filtering Subjects contains HTML code

[Gordon Veri]

Hello,

We have been using Mimedefang for nearly a year now  at the company I work
at with great success. We have some spam coming through because of what I
believe is HTML code or illegal characters in the subject line.  Below is
a sample from the sendmail log showing the subject line.  Is there anyway
to get rid of the messages that begin with '=?utf-8'?  Any rule examples
would be appreciated or a point in the right direction?

Oct 27 08:08:10 skyextmta mimedefang.pl[27226]:
MDLOG,i9RE7V75027868,mail_in,4.266,217.239.20.9,<xxxxxxxxx at xxxxxxxxx>,<xxxxxxx at xxxxxxxxxx>,=?utf-8?q?youngish
ang ruttish?= =?utf-8?q? misses are awaitin?= =?utf-8?q?g you!?=

Thanks,

Gord