Baishi express domain name account number begins

Start with a letter. Different letters of Best Express represent different types of express delivery or services. A stands for general express business, B stands for e-commerce express business, C stands for international express business, D stands for special logistics express business, E stands for large-scale logistics express business, F stands for cold chain logistics express business, G stands for supply chain logistics express business, H stands for medical logistics express business and J stands for express business.