dead mail

7.2

Mail that cannot be delivered or returned to its sender

noun

: correo muerto

The post office sends all dead mail to a special facility for further inspection.

Examples

Sometimes, valuable items are discovered among the stacks of dead mail.
I received a notice about dead mail yesterday.
After checking every address, they finally classified the package as dead mail.
The post office handles dead mails every week.
After checking every address, they finally classified the package as dead mail.
The post office sends all dead mail to a special facility for further inspection.
Sometimes, valuable items are discovered among the stacks of dead mail.

Synonyms

dead letter

vsdead mail

1 7.7

A piece of mail that cannot be delivered or returned to the sender

is the general term for undeliverable mail rather than a single item

nixie

vsdead mail

Jargon

9.9

Mail that cannot be delivered because of a wrong or incomplete address and is returned to the sender

is undeliverable and not returned, unlike mail sent back for a bad address

Surface Forms

dead mail singular

dead mails plural

Morphology

dead + mail

The meaning 'mail that cannot be delivered or returned' is directly inferable from combining 'dead' (no longer functioning/active) with 'mail' — the adjective 'dead' metaphorically signals inactivity or failure, so learners can deduce it refers to undeliverable mail. This parallels the common term 'dead letter' and similar cross-linguistic patterns, making the composition immediately comprehensible to a B1 learner who knows both words.

Etymology

The term dead mail comes from old post office practice: letters and packages that could not be delivered to the person or returned to the sender were called 'dead' because they had nowhere to go. They were kept in a 'dead letter' pile or 'dead letter office', so today dead mail means 'mail that cannot be delivered or returned'.