How to write a resignation letter that's effective immediately? Create an Immediate Resignation Letter without a notice period using our free printable templates.Resign with a professionally designed document. 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. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. Resignation Letter No Notice. Customize any of these resignation letters in minutes using our free AI-powered resignation letter builder.. Since there is no requirement for any notice on either part there is no need to apologise. It's time to quit the job, and you're not giving two weeks' notice.