Add DNSBL sites as defaults

defaults/main.yml

@@ -28,3 +28,11 @@ postfix_alias_maps:
 
 tls_helper_domains_file: tls_domains
 tls_helper_postfix_dir: /var/lib/postfix/tls-helper
+
+postfix_postscreen_dnsbl_sites:
+  - name: bl.spamcop.net
+    multiplier: 1
+  - name: ix.dnsbl.manitu.net
+    multiplier: 2
+  - name: "zen.spamhaus.org=127.0.0.[2..11]"
+    multiplier: 2