cronmailer: install msmtp-mta on Debian

manifests/cronmailer.pp

@@ -16,7 +16,15 @@ class profiles::cronmailer {
   file_line { 'create root alias':
     ensure => present,
     path   => '/etc/aliases',
-    line   => "root: root+${hostname}@lysator.liu.se",
+    line   => "root: root+${::hostname}@lysator.liu.se",
     match  => '^root:',
   }
+
+  case $facts['os']['family'] {
+    'Debian': {
+      package { 'msmtp-mta':
+        ensure => installed,
+      }
+    }
+  }
 }