USPS Technical Specifications for Mail.dat and Mail.xml
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USPS Mail.dat Technical Specification
USPS Mail.XML Tech Spec Data Distribution (DD)
USPS Mail XML Tech Spec Facility Access and Shipment Tracking (FAST)
USPS Informed Delivery eDoc Support Mailer Guides
Other
Technical Specifications
11/28/2022
Mail.XML Technical Specifications R57.0.0.0 V3

Technical Specifications
08/30/2022
Mail.XML Technical Specifications R56.0.0.0 V1

Technical Specifications
08/30/2022
Mail.dat Technical Specifications R56.0.0.0 V1

Technical Specifications
06/13/2022
Mail.dat Technical Specifications R55.0.0.0 V3

Technical Specifications
06/07/2022
Mail.XML Technical Specifications R55.0.0.0 V1

Technical Specifications
12/10/2021
Mail.XML Technical Specifications R54.0.0.0 V3

This document contains information pertaining to Mail.

Technical Specifications
12/10/2021
Mail.dat Technical Specifications R54.0.0.0 V3

Technical Specifications
07/13/2021
Mail.XML Technical Specifications R53.0.0.0 (Version 2)

This document contains information pertaining to Mail.

Technical Specifications
07/13/2021
Mail.dat Technical Specifications R53.0.0.0 (Version 3)

This document contains information pertaining to Mail.

Technical Specifications
04/05/2021
Mail.dat Technical Specifications R52.1 (Version 1)

This document is a comprehensive technical guide that outlines steps for exchanging electronic data with the PostalOne!® system using the Mail.dat® file format.

Technical Specifications
02/16/2021
Mail.XML Technical Specifications R52.1 (Version 1)

This document contains information pertaining to Mail.

Technical Specifications
02/19/2020
FAST Mail XML 16.0 R35 Ed 2 Technical Specifications

Technical Specifications
02/19/2020
FAST Mail XML 14.0A R35 Ed 2 Technical Specifications

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