In my opinion, we should use our personal ID and cc it to our company ID along with the persons we send it to. Below is a sample union resignation letter.You should check your union's constitution and bylaws to see if it is specific to whom a resignation must be sent. In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own. Don't write anything negative in the resignation letter 1 regardless of circumstances. Just write the letter as you would normally do and be done with. Then, state your intent to resign and exact date of departure. If, for example, an email is not acknowledged, send it again, and then pick up the phone or write a letter, with a copy to the editor in chief. Hey, maybe something good will come out of Sharon Goodwin (S. Latest Entertainment Videos.