Whether a lawyer's letter is issued or not, and whether the lawyer's letter is sent to the address alone or to the work unit, is decided by the issuing party and is legal. Another point to note is that the role of the lawyer's letter is to express attitude or have a deterrent effect. Receiving and sending a lawyer's letter is just like receiving an ordinary express mail. It will not affect your current work, but you need to prepare a response strategy for the next stage based on the content of the other party's lawyer's letter.