You can try this (from the ISPConfig installation manual):
SpamAssassin
The ISPConfig comes with SpamAssassin, but without the Perl modules needed by
SpamAssassin. Run the following command after the installation of the ISPConfig:
/home/admispconfig/ispconfig/tools/spamassassin/usr/bin/spamassassin
If errors appear you have to install some Perl modules.
Code:
perl -MCPAN -e shell
install HTML::Parser
install DB_File
install Net::DNS (when prompted to enable tests, choose "no")
install Digest::SHA1
To leave the Perl shell type
q
If
/home/admispconfig/ispconfig/tools/spamassassin/usr/bin/spamassassin
does not return any error everything is fine. You can then leave SpamAssassin by typing
" CTRL + c".