These days AFAIK postage stamps are printed using offset, and thermal plates. In Canada they’re printed 10 micron FM and I believe Canada Post also prints stamps for other countries. You can go to their website and order full uncut sheets of stamps.Goodness, no wonder! I have heard (but no confirmation) that they are still sometimes used for postal stamps.
Over the past few years I’ve watched a group of transactional and direct mail printers strategically shift from monochrome toner machines to full-color toner and inkjet presses. Most banished old black-only toner boxes but kept their color toner devices around because they anticipated needing both color inkjet and toner presses to meet customer needs. They were right then and continue to be right today. Because toner and inkjet can be better together. Read the Post