services/nomad/apps: Include rDNS check for Maddy

Author: the-maldridge

services/nomad/apps/maddy.conf

@@ -58,11 +58,11 @@ smtp tcp://0.0.0.0:25 {
     dmarc yes
     check {
         require_mx_record
+        require_matching_rdns
         dkim
         spf
 
-        dnsbl zen.spamhaus.org
-
+        dnsbl zen.spamhaus.org bl.spamcop.net b.barracudacentral.org
     }
 
     source $(local_domains) {
@@ -88,11 +88,11 @@ submission tls://0.0.0.0:465 tcp://0.0.0.0:587 {
 
     check {
         require_mx_record
+        require_matching_rdns
         dkim
         spf
 
-        dnsbl zen.spamhaus.org
-
+        dnsbl zen.spamhaus.org bl.spamcop.net b.barracudacentral.org
     }
 
     source $(local_domains) {