Updated Mail.dat Tech Specs Guide
The USPS released an updated Mail.dat Technical Guide on January 9, 2023 — Version 4, Release 57. The technical guide that outlines steps for exchanging electronic data [...]
Mail.dat
PostalOne! Changes April 25, 2021; New Mail.Dat Client Required
This document details software updates scheduled for Sunday, April 25, 2021. Impacted Commercial Systems include: — PostalOne! System Release 52.1.0.0 * — [...]
Mail.dat Technical Specifications R50 (Final Version)
The USPS has released the final version of the Mail.dat Tech Specifications, effective January 12, 2020 … (click to [...]
Updated Mail.dat and Mail.XML Specifications
The Postal Service has released the following updated specifications (click to see): Mail.XML Technical Specification R50 (Version 2) Mail.dat Technical Specifications R50 [...]
New Mail.dat Technical Specifications
The USPS has released new Mail.dat Specifications on June 9, 2019. Click to download Mail.dat Technical [...]
Required Mail.dat Client Version For June Price Change
The June Price Change 2019, PostalOne! System Release 49.0.0.0, will result in a new required Mail.dat client version. Users should download Mail.dat client version [...]
New Required Mail.dat Client Version On March 17, 2019
PostalOne! System Release 48.1.0.0 will result in a new required Mail.dat client version. Users should download Mail.dat client version 48.1.0.0_PROD from the Business [...]
New Mail.dat Regulations Effective October 22
The Postal Service has released new technical specifications for Mail.dat that are effective October 22, 2017 … (click to read [...]
Updated Mail.dat Regs Effective June 25
The USPS has released an updated Mail.dat technical guide effective June 25, 2017. It outlines steps for exchanging electronic data with the PostalOne! system using the [...]
New Mail.dat Specs Released
The USPS released May 21 the new Mail.dat comprehensive technical guide that outlines steps for exchanging electronic data with the PostalOne! system using the Mail.dat file [...]
New Mail.dat Specs Released
The USPS released new Mail.dat Technical Specifications, Version 3, dated April 3, 2017. (click to [...]
New Mail.dat Specs From USPS
The Postal Service released the new Mail.dat Technical Specifications publication effective March 17, 2017. The 375-page document details steps for exchanging electronic data [...]
New Mail.dat Technical Specifications Released
The USPS released the updated comprehensive technical guide that outlines steps for exchanging electronic data with the PostalOne! system using the Mail.dat file format. The [...]
ALERT: Mail.dat Submission Problem
The USPS has issued the following alert for Mail.dat Submission Issues … (click to [...]
Mail.dat Changes Ahead
Information on timelines for the Mail.dat and Mail.XML version start and termination dates for the following [...]