spampd: Force SA to use local DNS resolver

Work around blacklists blocking high volume DNS resolvers.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

roles/spampd/templates/local.cf.j2

@@ -7,7 +7,7 @@
 #
 ###########################################################################
 
-#dns_server 127.0.0.1
+dns_server 127.0.0.1
 
 #   Add *****SPAM***** to the Subject header of spam e-mails
 #