How to write a resignation letter that's effective immediately? I'm sorry to leave without notice.Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. Download Minnesota Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. You say that there was a policy that required 30 day notice.