Direct mail is opt-out, no prior consent is needed for sending addressed commercial direct mail. Direct mail address lists must cleaned with the direct mail opt-out register. This follows from the Code Postfilter, which is entrenched in Dutch self regulation. Individuals can register for free online, establishing a personal page on postfilter.nl where data and preferences can be updated. Individuals can indicate from which sectors they do or do not wish to receive unsolicited mail addressed advertising. Companies are required to clear their list with the register, but they can still contact individuals who are already customers. For more info see Suppression Files.