How do I cancel my "Ship to Me" Printing order? QuantumPostcards Support December 04, 2017 22:16 Updated Simply call our Customer Support line at 800-637-7373 and one of our friendly representatives can assist you. Related articles How do I cancel my Direct Mail order? Can I combine On-demand Printing orders? Cancel a Social Ad Order How to change company / brokerage info What is the delivery time for Direct Mail orders?