I sent in photos for printing postcards. A UPrinting staffer modified the mailing info side of the postcard without notifying me. When I received the postcards, they were not mailable by Post Office requirements. I initially assumed it was my fault in the initial submission and threw out all but one of the unusable postcards, but later discovered it wasn't my error after I had disposed of the postcards. Uprinting refused re-printing the postcards without proof I still had the unmailable postcards. I suggested cost-sharing proposals in the re-print, but they refused. Lesson learned. Will now seek alternative printer.