dead mail

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Noun1.dead mail - mail that can neither be delivered nor returned
letter, missive - a written message addressed to a person or organization; "mailed an indignant letter to the editor"
References in periodicals archive ?
Mussa confessed during questioning that he received an Israeli telephone number to communicate with the Mossad and that he was paid for his efforts through what he called "The Fast Dead Mail Service.
The Mail File Analyzer focuses on mail file problems, such as making it easy to locate dead mail files, identifying mail files with no owner, users with no mail files, and mail files that do not meet corporate standards, because they are too large, have too many attachments or have exceeded the specified quota.
Before, individual post offices and letter carriers answered what they could, or simply forwarded Santa Claus letters to the dead mail department.