Some post arrived for you — it was in my letterbox.
kas-SET-ta — stress the second syllable; double 's' and double 't' both give held sounds.
Use this when you receive mail addressed to a neighbour — which happens frequently in Italian apartment buildings where postmen sometimes place letters in the wrong cassetta delle lettere (letterbox).
Receiving a neighbour's mail is a common experience in Italian buildings, where letterboxes are sometimes unlabelled or the postino (postman) makes mistakes. Promptly returning misdelivered mail is a fundamental neighbourly courtesy. The verb trovare (to find) is useful here to avoid implying the postman made an error.
Il postino ha lasciato questo da me per sbaglio.
The postman left this at mine by mistake.
Attributes the error to the postman rather than the neighbour; polite and accurate.
Hai ricevuto della mia posta?
Have you received any of my post?
Asking whether a neighbour has mistakenly received your mail; useful if you're expecting something.
La raccomandata è nella cassetta del portiere.
The registered letter is in the caretaker's box.
When a raccomandata cannot be delivered, the postino may leave it with the portiere.
Italy's postal service (Poste Italiane) has one of Europe's highest rates of misdelivered mail, partly due to inconsistent addressing practices in Italian cities. Italian buildings often have multiple surnames listed on a single buzzer — generations of the same family or successive tenants who never updated the label. Italian postal culture places high responsibility on neighbours to cooperate in ensuring everyone receives their mail.