diff --git a/files/postfix/etc/postfix-policyd/zimbra.conf.tmpl b/files/postfix/etc/postfix-policyd/zimbra.conf.tmpl
index b90af9972f9dc00d32241e33645caa0cff9eace6..1dcf451bb240094344b65cbe9ae43991024db29f 100644
--- a/files/postfix/etc/postfix-policyd/zimbra.conf.tmpl
+++ b/files/postfix/etc/postfix-policyd/zimbra.conf.tmpl
@@ -166,7 +166,7 @@ CONN_ACL="127.0.0.1"
 #   if you want to allow any of the whitelisting features.
 #
 #                                                     1=on  0=off
-WHITELISTING=1
+WHITELISTING=0
 
 #
 # whitelist null sender:                              default: off
@@ -186,7 +186,7 @@ WHITELISTNULL=0
 #   forge senders and domains a lot.
 #
 #                                                     1=on  0=off
-WHITELISTSENDER=1
+WHITELISTSENDER=0
 
 #
 # whitelist client dns name