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.The header at the top of the resignation letter (the same thing as a letterhead) should include your name, address, phone number and email. Here's a resignation letter template you can use to ensure a smooth transition process and avoid losing your connections as you move forward. Below you will find a template resignation letter that follows best practices for directors of public companies. Click here to download an editable PDF version of the sample letter. Quit your job gracefully. Simple Resignation Letter Template. . And then in closing, I want you to make sure that you sign off in the most professional and graceful way as possible.