All RCVD_IN_VALIDITY rules being applied to every email.

[Mark London]

FWIW, Today I discovered that RCVD_IN_VALIDITY_CERTIFIED, 
RCVD_IN_VALIDITY_RPBL, and RCVD_IN_VALIDITY_SAFE, were being triggered 
for every email that our server received.  I do not use a public DNS 
server.  I disabled all of them.  Strange. - Mark