On Wednesday, Australian Twitter user Jo Thornely bemoaned her inability to register her address as "Doona Castle".
Australia Post won't let me change my address to 'Doona Castle'.
Australia Post finally got back to her on Thursday, explaining that blanket forts were impossible for them to penetrate.
@jothornely I apologise for any inconvenience this is causing, the logistics of delivering mail to a fortress of blankets is beyond us- Emma