Which detail must appear on outer packaging?

• A. Recipient address on outer packaging
• B. Address of sender on outer packaging
• C. Return address on all emails
• D. Postage stamp colour

Answer: (B)

Having a return address on outer packaging is essential because it lets the postal service return the item if delivery fails and provides a reliable point of contact for the sender. This traceability is important for handling, accountability, and, in cross-border shipments, for communication with customs or other authorities. The recipient’s address is also necessary to reach the destination, but the requirement highlighted here is specifically about including the sender’s address on the outside. The other possibilities don’t fit because the color of a postage stamp isn’t a mandatory packaging detail, and return addresses on emails aren’t about physical outer packaging.