Infringement. The lawyer's letter is genuine. The content of the lawyer's letter is that Pinduoduo's store was said to have trademark infringement issues, and the lawyer's letter was sent via text message. Lawyer's letter writing is a basic lawyer's business content, and it is also one of the basic skills of document writing. Lawyer's letters are often used to remind the other party to perform the contract in a timely manner, warn the consequences of breach of contract, etc., and often occur on the eve of litigation.