Thanks.io supports five mailer types: postcards (4×6, 6×9, 6×11), letters (windowed and windowless), notecards (5×4 folded), branded gift cards, and MagnaCards (6×9 pop-out fridge magnets). Every mailer type supports handwritten-style personalization, dynamic QR codes, per-recipient variables, and Standard or First Class postage.
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