http://github.com/filippocarletti/qpsmtpd/blob/0c8c3fbd4a79d4ef3536ff90e3bb1595bbad0fe9/packaging/rpm/files/qpsmtpd-0.83-clamav-headers.patch
I don't know the details, but headers have to be at top or problems with digitally signed mail arise. -- Ciao, Filippo
