Learner's definition of SOLE. always used before a noun. 1. : only or single. He became the sole heir to the property. the sole owner. The sole aim/objective/purpose of the program is to help the poor. She was the sole survivor of the tragedy. Icy roads were the sole cause of the accident. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples
Dead letter mail or undeliverable mail is mail that cannot be delivered to the addressee or returned to the sender.ith increased collection and study of the postal markings originating from such offices, the body of literature on this obscure topic may grow. Many countries, including Canada and the United States, have issued special labels for envelopes that have travelled through the dead letter office.
No Return Address. If there is no return address on your letter or package, the post office will try to send it to the recipient with a Postage Due stamp. The recipient will have to pay the additional postage before being able to receive the letter.If the person declines, then it becomes dead mail..If it's a magazine or other printed matter without sufficient postage, the post office will dispose of it.he recipient will have to pay the additional postage before being able to receive the letter. If the person declines, then it becomes dead mail.. If it's a magazine or other printed matter without sufficient postage, the post office will dispose of it.