Yes SF Express has legal effect. Real-name registration system is needed for express delivery. If you send contraband, you will be investigated for legal responsibility according to law. SF's rejection notice should be coordinated with the recipient. The relevant express delivery law stipulates: Article 312 The amount of compensation for damage or loss of goods, if agreed by the parties, shall be in accordance with the agreement; If there is no agreement or the agreement is unclear, and it cannot be determined according to the provisions of Article 61 of this Law, it shall be calculated according to the market price of the place where the goods arrive at the time of delivery or should be delivered. Where there are other provisions in laws and administrative regulations on calculation methods and compensation limits, those provisions shall prevail.