pretinac

1. Croat. compartment; drawer; pigeonhole
   Ključevi su u gornjem pretincu. — The keys are in the top drawer.
2. Croat. (of mail) mailbox; P.O. box; inbox
   Poruka je završila u pretincu za neželjenu poštu. — The message ended up in the spam folder.
   Pošalji to na moj poštanski pretinac. — Send it to my P.O. box.

In Serbia the word is pregradak or fioka; a P.O. box is poštanski pregradak, an email box is sanduče.