All mydestination to be blank (#162)

manifests/mta.pp

@@ -46,8 +46,13 @@ class postfix::mta (
     postfix::config { 'relayhost': value => $relayhost }
   }
 
+  if ($mydestination == 'blank') {
+    postfix::config { 'mydestination': ensure => 'blank' }
+  } else {
+    postfix::config { 'mydestination': value => $mydestination }
+  }
+
   postfix::config {
-    'mydestination':       value => $mydestination;
     'mynetworks':          value => $mynetworks;
     'virtual_alias_maps':  value => 'hash:/etc/postfix/virtual';
     'transport_maps':      value => 'hash:/etc/postfix/transport';

spec/classes/postfix_mta_spec.rb

@@ -19,6 +19,18 @@ describe 'postfix::mta' do
       it { is_expected.to contain_postfix__config('mydestination').with_value('bar') }
       it { is_expected.to contain_postfix__config('mynetworks').with_value('127.0.0.1/8, [::1]/128 ![::2]/128') }
       it { is_expected.to contain_postfix__config('relayhost').with_value('foo') }
+
+      context "when mydestination => 'blank'" do
+        let :pre_condition do
+          "class { 'postfix':
+            mydestination => 'blank',
+            mynetworks    => '127.0.0.1/8, [::1]/128 ![::2]/128',
+            relayhost     => 'foo',
+          }"
+        end
+
+        it { is_expected.to contain_postfix__config('mydestination').with_ensure('blank').without_value }
+      end
     end
   end
 end