SPAMASSASSIN

Disable OpenWhois RBL (it is dead/defunct/no longer active):

You might see this in your headers
2.4 DNS_FROM_OPENWHOIS RBL: Envelope sender listed in bl.open-whois.org

comment out this inside /usr/share/spamassassin/72_active.cf
##{ DNS_FROM_OPENWHOIS

ifplugin Mail::SpamAssassin::Plugin::DNSEval
header          DNS_FROM_OPENWHOIS  eval:check_rbl_envfrom('openwhois', 'bl.open-whois.org.')
describe        DNS_FROM_OPENWHOIS  Envelope sender listed in bl.open-whois.org.
tflags          DNS_FROM_OPENWHOIS  net publish
endif
##} DNS_FROM_OPENWHOIS