Sim cannot publish books

Try resetting your user files as described in the factory reset described in this post: http://answers.ea.com/t5/The-Sims-4/FAQ-Troubleshooting-Steps-amp-Known-Issues/m-p/3621199

You won't loose anything. Just make sure to not delete any files  and make a backup.

Try on a new game with nothing added back first (start new game). If it works, put back your save game and try again. If it still works, you can start putting stuff back.

• Options.ini (or just re-set all your settings manually)
• Tray Folder
• Screenshots/Videos/Custom music
• Rest of the save games (leave out slot_00000001.save which is the autosave)
• Custom content like clothing, hair, skins, make up ....
• Mods (one by one, making sure they all still work)

The rest does not need putting back, cause they are mostly cache files that recreate or log files that are not needed for the game. 

I have the same problem - my Sim lives in an apartment and can't publish books - there aren't any options for publishing when I click on a mailbox. I have never used any cc or mods

@Annytta I can't reproduce this, are you sure the book is done?

yes, it's in my inventory

Could you try with a new save?

In a new save everythings ok, I'm able to publish my books.... , thank you 😉 could you tell me is there a way to move my household with its progress in collecting postcards, mySim trophies, etc. to a new save?

You could try uploading your Sim to the Library or Gallery, and the trophies and card displayed in a room as well. 

Or cheat the cards and trophies in. 

You can actually now buy an apartment Mailbox if you type it on build mode 🙂