1, which means different: express delivery refers to the logistics transportation mode of goods sent by express delivery company, which pursues speed, while mailing refers to the service sent by post office, which mainly pursues the safety of goods. 2. Different concepts: Express delivery is a new mode of transportation for logistics enterprises to quickly deliver packages entrusted by senders to recipients through their own networks or networking. Mailing requires me to go to the post office to go through the corresponding procedures and pay the corresponding fees. 3. Different emphases: Express delivery is mainly carried out through the network of express delivery companies, while mail business is carried out through continuous delivery between post offices. There will be a certain gap between the speed of the two, and the general express delivery will be faster than the mail. Express delivery refers to the logistics and transportation of goods sent from express delivery companies, with speed as the pursuit.