What is the term for the address of the person sending a package or mail?

The correct term for the address of the person sending a package or mail is "Return Address." This address is strategically placed on the envelope or package so that it indicates where the mail should be returned if it cannot be delivered to the recipient for any reason. Including a return address ensures that in the event of issues with delivery — such as an incorrect address or the recipient being unavailable — the mail can be sent back to the sender.

In contrast, while "Sender's Address" might seem similar, it is less commonly used in postal terminology. "Mailing Address" generally refers to the address of the intended recipient rather than the sender. "Resender's Address" is not a standard term used in mailing contexts; it might imply a second sender who is forwarding the mail, which is not the main focus when discussing the original sender’s address. Therefore, "Return Address" is the precise term used in mailing practices to identify the sender’s location for returns.