Undeliverable definitions

Undeliverable

A mailing piece returned to the mailer as undeliverable for reason of incorrect name or address. (see Nixie).
Found on http://www.encyclo.co.uk/local/21134

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Undeliverable

Mailing piece returned as not being deliverable; also known as a nixie.
Found on http://www.nmoa.org/Library/index.htm

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