It is not nescessary to install spamassassin. Just install the missing perl modules as described in the ISPConfig installation manual:
http://www.ispconfig.org/manual_installation.htm
It is also described in the ubuntu Howto, at the end of this page:
http://www.howtoforge.com/perfect_setup_ubuntu_5.10_p5
Quote:
Install some Perl Modules needed by SpamAssassin (comes with ISPConfig)
apt-get install libhtml-parser-perl libdb-file-lock-perl libnet-dns-perl
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