I think you are know the TMS Logisik Spam. I get it 10 times a day.
You should look at
http://tms-logistik.de/ a really nice site about spambots and the fucking spammails.
I using postifx-pcre to reject this mail on SMTP connect. If you reject this mails on SMTP connect your mailq does not blow up and it does not slow down your mailserver.