Argument "n.nn" isn't numeric in addition (+) at /usr/local/lib/perl5/site_perl/5.8.4/Mail/SpamAssassin/Conf.pm line 238.
Any idea? How to fix it?
Looks like you have an invalid score statement in one of your config files....
either it's non-numeric, or you gave it 0, 2, or 3 scores instead of 1 or 4.
Try spamassassin --lint and see if it points out anything.
