This addon will make your notifications for direct messages and notifications stand out. Now your users shouldn't miss anything important. There are permissions for which groups can see the notification blocks.
This also has a permission for user groups so they can disable the notices from their user preferences menu.
Example:
User Preferences:
Style Properties:
Permissions:
This also has a permission for user groups so they can disable the notices from their user preferences menu.
Example:
User Preferences:
Style Properties:
Permissions: