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Industry Alert: PostalOne! Release – New Required Mail.dat Client Version

February 18, 2019

On February 15, 2019, the Postal Service issued a reminder that the upcoming PostalOne! System Release will result in a new required Mail.dat client version:

On March 17, 2019, PostalOne! System Release will result in a new required Mail.dat client version.  Users should download Mail.dat client version from the Business Customer Gateway (BCG) using the following path: Mailing Services è Electronic Data Exchange [Go to Service] è Mail.dat download (Windows 32-bit, Windows 64-bit or Solaris).

The updated DRAFT Pre-Release Notes document (Change 3.0) with details on the March 17, 2019 release is posted to PostalPro:  https://postalpro.usps.com/march17releasenotes

Please direct any inquiries or concerns to the PostalOne! Help Desk via eMail (postalone@usps.gov) or telephone (1-800-522-9085).

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