The /etc/procmailrc file is used by procmail to determine the procmail helper programs that should be used to filter mail. This file isn’t created by default.
spamassassin has a template you can use called /etc/mail/spamassassin/spamassassin-spamc.rc. Copy the template to the /etc directory.
# cp /etc/mail/spamassassin/spamassassin-spamc.rc /etc/procmailrc
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source:http://linuxpoison.blogspot.com/2007/10/13578175801409.html