PostalPro|August 2016 Releases RSShttps://postalpro.usps.com/2633/rss.xmlAugust 2016 Releases Postsen Postal Service Mail.dat Technical Specification Version 1 Release 44 https://postalpro.usps.com/node/1256 Postal Service Mail.dat Technical Specification Version 1 (R44) is a comprehensive technical guide that outlines steps for exchanging electronic data with the PostalOne! ® system using the Mail.dat® file format. Tue, 26 Apr 2016 00:00:00 -0400