SIMS 3 my sim wont audition & mailbox isn’t working

belizeandolll  Where are you having your sim audition, and what level does your sim have in the career?  Can your sim successfully audition elsewhere?  The problem might be limited to the lot or proprietor.

For the mailbox, move your sim to a different lot, use "save as" to rename the save (so your original stays intact under its old name), quit, reload, and test the mailbox.  If it works, you can move your sim back to the original house.  Whether this helps or not, it's useful information, so let me know.