just install the backported spamassassin.
add this to /etc/apt/sources.list.d/debian-wheezy-backports.list
Debian wheezy Backports repository
deb http://ftp.nl.debian.org/debian/ wheezy-backports main contrib non-free deb-src http://ftp.nl.debian.org/debian/ wheezy-backports main contrib non-free
and apt-get install -t wheezy-backport spamassassin
fixed.. thanks..