postfix: Abhängigkeiten ergänzt

manifests/postfix.pp

@@ -14,10 +14,12 @@ class ubuntu_server::postfix($root_emails,$relayhost = "mailer.gwdg.de") {
 
     service{'postfix':
         ensure => running,
+        require => Package['postfix'],
     }
 
     mailalias{'root':
         recipient => $root_emails,
+        require => Package['postfix'],
     } ~> Exec["mail-alias-refresh"]
 
     exec { "mail-alias-refresh":