Qmail & SpamAssassin - Change Default Rules Score

Under this directory:

/var/qmail/mailnames/DOMAIN-NAME/USERNAME/.spamassassin

edit user_prefs and add the new Score for desire rule:

Example:

score RDNS_NONE 5.0

that overrides the defualt score.

You can find all rules here:

http://wiki.apache.org/spamassassin/Rules/