The Post office of Thailand former known as CAT have spanked themselves up a bit and is now offering food with the mail. They have gathered difference special dishes that people in Bangkok might wants.
You can get the creamed filled buns from Uthai Thani, stuffed baguettes from Udon Thani or maybe fish balls from Phuket. All the food is available in Bangkok as well but not the original version.
You need to Pay before the order is confirmed and if you want more info or order you can go to thailandpost.co.th or call 1545.
Please not that the delivery is only in Bangkok for now