Legal basis: Article 2 of China Hangzhou Government Portal 12345 "Interim Measures for Handling Mayor's Mailbox E-mail" stipulates that the working principle is 1, and the principles of "graded responsibility and centralized handling" and "whoever is in charge is responsible" are adhered to; 2. Adhere to the principle of solving problems in a timely, local and legal manner; 3. Adhere to the principle of combining policies, regulations and seeking truth from facts; 4. Adhere to the principle of combining ideological guidance with solving practical problems; 5. Adhere to the principles of openness, efficiency, convenience, enjoyment and service.