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:
score DNS_FROM_RFC_BOGUSMX 0 1.464 0 1.668 # n=0 n=2 score DNS_FROM_RFC_DSN 0 0.001 0 0.001 # n=0 n=2
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
header SPF_NONE eval:check_for_spf_none() describe SPF_NONE SPF: sender SPF record missing score SPF_NONE 0.1