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Back in December when Mailstream Plus v2025.12 first released, I was advised with the following: "Mailstream Plus v2025.12 need to be installed with the Dec. 2025.12 MSP 2025.12 postal reference files...Additional note is the ver 2025.12 is for mailings sent to the USPS Jan. 18, 2026 or later. Before ...
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