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 Informed Delivery eDoc Support Mailer Guides
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Technical Specifications
03/18/2026
Mail.dat Technical Specifications R64.0.0.0

Technical Specifications
12/05/2025
Mail.dat Technical Specifications R63.0.0.0

Technical Specifications
06/10/2025
Mail.dat Technical Specifications R62.0.0.0

Tech Guides
12/03/2024
Mail.dat Technical Specifications R61.0.0.0 V2

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