1-15-2020 - Guide updated with new Terms and Conditions.

4-16-2021 - Guide updated with new Terms and Conditions as of 3-22-2021, new TEM environment information, Mail.dat release 21-1, and minor edits.

4-30-2021 - Guide updated with new Terms and Conditions as of 4-23-2021.

3-14-2022 - Guide updated for the new 22-1 Mail.dat version and the new fields added to the RMS file. 

6-28-2022 - Guide updated to reflect the implementation of the new fields added to PO!

6-1-2023 - Guide updated to reflect versions supported as of the PostalOne! July 2023 Price Change - Release 58.0 - including Mail.dat 23-1.