韵达，被立案调查！

Group 1 - The core issue involves significant security management vulnerabilities among some franchisees of Yunda Express, leading to the entry of fraudulent promotional materials into the delivery channels, resulting in substantial financial losses for victims [1] - The Shanghai Yunda Freight Company is held responsible for inadequate management of its franchisees and failure to implement unified safety management as required [1] - The National Postal Administration has initiated a formal investigation into Shanghai Yunda Freight Company based on these findings [1]