Fix issue with multiple mynetworks.

manifests/mta.pp

@@ -35,7 +35,7 @@ class postfix::mta (
               'Wrong value for $relayhost')
   validate_re($mydestination, '^\S+(?:,\s*\S+)*$',
               'Wrong value for $mydestination')
-  validate_re($mynetworks, '^\S+$',
+  validate_re($mynetworks, '^(?:\S+?(?:(?:,\s)|(?:\s))?)*$',
               'Wrong value for $mynetworks')
 
   # If direct is specified then relayhost should be blank

spec/classes/postfix_mta_spec.rb

@@ -8,12 +8,12 @@ describe 'postfix::mta' do
   let :pre_condition do
     "class { 'postfix':
       mydestination => 'bar',
-      mynetworks    => 'baz',
+      mynetworks    => '127.0.0.1/8, [::1]/128 ![::2]/128',
       relayhost     => 'foo',
     }"
   end
 
   it { is_expected.to contain_postfix__config('mydestination').with_value('bar') }
-  it { is_expected.to contain_postfix__config('mynetworks').with_value('baz') }
+  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') }
 end