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Mail.dat

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 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 [...]