Ancillary Service Endorsements
Fact Sheets
03/03/2026
Ancillary Service Endorsement Fact Sheet

Ancillary service endorsements are used by mailers to request an addressee’s new address or the reason mail cannot be delivered as addressed and to provide the US Postal Service with instructions on how to handle Undeliverable As Addressed (UAA) mailpieces.

Fact Sheets
03/03/2026
Ancillary Service Endorsement Fact Sheet

Ancillary service endorsements are used by mailers to request an addressee’s new address or the reason mail cannot be delivered as addressed and to provide the US Postal Service with instructions on how to handle Undeliverable As Addressed (UAA) mailpieces.

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