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Disable OpenWhois RBL (it is dead/defunct/no longer active):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