Move DNSBL to postscreen (fixes #45)

roles/mailserver/files/etc_postfix_master.cf

 # service type  private unpriv  chroot  wakeup  maxproc command + args
 #               (yes)   (yes)   (yes)   (never) (100)
 # ==========================================================================
-smtp       inet  n       -       -       -       -       smtpd
-#smtp      inet  n       -       -       -       1       postscreen
-#smtpd     pass  -       -       -       -       -       smtpd
-#dnsblog   unix  -       -       -       -       0       dnsblog
-#tlsproxy  unix  -       -       -       -       0       tlsproxy
+#smtp      inet  n       -       -       -       -       smtpd
+smtp       inet  n       -       -       -       1       postscreen
+smtpd      pass  -       -       -       -       -       smtpd
+dnsblog    unix  -       -       -       -       0       dnsblog
+tlsproxy   unix  -       -       -       -       0       tlsproxy
 #submission inet  n       -       -       -       -       smtpd
 #  -o syslog_name=postfix/submission
 #  -o smtpd_tls_security_level=encrypt

roles/mailserver/templates/etc_postfix_main.cf.j2

   reject_non_fqdn_hostname,
   reject_non_fqdn_recipient,
   reject_unknown_recipient_domain,
-  reject_rbl_client multihop.dsbl.org,
-  reject_rbl_client zen.spamhaus.org,
-  reject_rbl_client cbl.abuseat.org,
-  reject_rbl_client bl.spamcop.net,
-  reject_rbl_client dnsbl.sorbs.net,
-  reject_rbl_client all.spamrats.com=127.0.0.36,
-  reject_rbl_client all.spamrats.com=127.0.0.38,
-  reject_rbl_client dnsbl.ahbl.org,
   check_policy_service inet:127.0.0.1:10023,
   permit
 
 smtpd_client_restrictions =
   permit_sasl_authenticated
   check_client_access pcre:/etc/postfix/dspam_filter_access
+
+# Postscreen
+postscreen_access_list = permit_mynetworks
+postscreen_dnsbl_sites =
+  multihop.dsbl.org*2
+  sbl-xbl.spamhaus.org*2
+  cbl.abuseat.org*2
+  bl.spamcop.net*2
+  dnsbl.sorbs.net*1
+  spam.spamrats.com*2
+  dnsbl.ahbl.org*2
+postscreen_dnsbl_threshold = 3
+postscreen_dnsbl_action = enforce
+postscreen_greet_action = enforce