postfix::mta - fixed small scope mismatch.

manifests/mta.pp

@@ -32,26 +32,27 @@
 #
 class postfix::mta {
 
-  case $::postfix_relayhost {
+  case $postfix_relayhost {
     '':      { fail('Required \$postfix_relayhost variable is not defined.') }
     default: {}
   }
 
-  case $::postfix_mydestination {
+  case $postfix_mydestination {
     '':      { $postfix_mydestination = '\$myorigin' }
     default: {}
   }
 
-  case $::postfix_mynetworks {
+  case $postfix_mynetworks {
     "":      { $postfix_mynetworks = "127.0.0.0/8" }
+    default: {}
   }
 
   include postfix
 
   postfix::config {
-    'mydestination':       value => $::postfix_mydestination;
-    'mynetworks':          value => $::postfix_mynetworks;
-    'relayhost':           value => $::postfix_relayhost;
+    'mydestination':       value => $postfix_mydestination;
+    'mynetworks':          value => $postfix_mynetworks;
+    'relayhost':           value => $postfix_relayhost;
     'virtual_alias_maps':  value => 'hash:/etc/postfix/virtual';
     'transport_maps':      value => 'hash:/etc/postfix/transport';
   }