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Postal Encyclopedia

Ancillary Service Endorsement

Forwarding/return instructions

Addressing & ListsUpdated 2026-07-24

Printed instructions such as Address Service Requested or Return Service Requested that tell USPS what to do with undeliverable 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

Need this applied to a real job?

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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