These rules have been removed from the SpamAssassin distribution.
RFC-Ignorant - enable blacklist from http://www.rfc-ignorant.org/
Disabled in 3.3.2 (June 2011) due to poor hit rate and accuracy:
As discussed in Bug 6490, this rule allows you to penalize senders for not implementing SPF. It is provided for the administrator to enable and score at their own risk. https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6490