🌍📯📅

#world post day #universal postal union #UPU #international mail #global post #postal horn #post day celebration

🏛️🤝📮

#universal postal union #UPU #postal organization #mail cooperation #postal treaty #berne

📜🌐✉️

#universal postal union #UPU #postal convention #treaty of berne #international mail agreements

📨🌏📬

#universal postal union #UPU #international letters #global communication network #mailbox standards

✉️🌐📮

#universal postal union #UPU #global mail #international post #postbox network