Pipe errors attempting to run SA

[Tom]

Hi there followed the steps layed out Postfix <http://www.postfix.org> 
First Step - Basic Integrating - at  
http://onetforum.com/fourm/viewtopic.php?p=27
from the http://wiki.apache.org/spamassassin/IntegratingSA
Now when I check my email  the new messages are now in the postfix mail que
When I check the /var/log/maillog I find the error listed below:
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Eserver pipe[3691]: fatal: pipe_command: execvp 
/usr/local/bin/spamfilter: Permission denied