add missing permission

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13217 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Permissions.py

@@ -58,6 +58,7 @@ ViewManagementScreens = permissions.ViewManagementScreens
 ManageProperties = permissions.ManageProperties
 FTPAccess = permissions.FTPAccess
 ImportExportObjects = ac_permissions.import_export_objects
+UseMailhostServices = ac_permissions.use_mailhost_services
 
 # Default CMF Core Permissions
 ListFolderContents = permissions.ListFolderContents