postfix: sasl, From rewrite

manifests/postfix.pp

@@ -30,8 +30,9 @@ class ubuntu_server::postfix($root_emails,$relayhost='mailer.gwdg.de',$generic_m
         file_line{'postfix_cfg_generic_maps':
             # http://www.postfix.org/regexp_table.5.html
             # https://www.linuxquestions.org/questions/linux-server-73/how-do-i-use-a-regexp-in-postfix-alias-table-544941/#post2707004
+            # http://www.postfix.org/ADDRESS_REWRITING_README.html
             path    => '/etc/postfix/main.cf',
-            line    => 'smtp_generic_maps = hash:/etc/postfix/generic_maps',
+            line    => 'smtp_generic_maps = hash:/etc/postfix/generic_maps regexp:/etc/postfix/generic_maps_regexp',
             match   => '^smtp_generic_maps',
             require => [ Package['mailutils'], Package['postfix'] ],
         } ~> Exec['generic-maps-refresh']