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Postal Encyclopedia

ACS

Address Change Service

Addressing & ListsUpdated 2026-07-24

A USPS electronic address-correction service that can tell mailers about moves and undeliverable pieces, so they don't rely only on physical returned mail.

Definition reviewed 2026-07-24. This is a plain-English Plavidian reference; for USPS terms, the Domestic Mail Manual is the authority. For your own job, the final mail class, postage, and preparation are confirmed after list processing and production review.

Related terms in Addressing & Lists

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Ask Plavidian Expert for an answer based on the USPS Domestic Mail Manual, or send us the job and we'll confirm the preparation before you print.

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