What products can be ordered through On-Demand Printing? QuantumPostcards Support September 01, 2017 01:06 Updated Postcards, flyers, booklets, brochures, business cards, door hangers, and more. Related articles Designing & Uploading a Digital Print File Can I personalize direct mail postcards with the names of people to which I'm mailing? What paper stock is used for the mailings? Will someone review my order after it has been placed? Can I have a postal indicia printed on my pieces and sent back to me?