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How to save sandwiches by mail, and get extra points for good answers.
It shouldn't go too far. I suggest you use express delivery instead of postal service. Postal service is slower and express delivery is faster. Nowadays, many express delivery companies provide good service.

Once, a friend gave me hairy crabs. After packaging, I put a special bag in the express box for refrigeration. After the refrigerator was frozen, I wrapped the food with insulation material, sealed it in a courier box, and stuffed it in the gap with some foam plastic or something. If there is no such cold bag, you can also use some water to freeze it in mineral water bottles and put it around the food to keep it warm.