How to write a resignation letter that's effective immediately? I'm sorry to leave without notice.Due to unforeseen personal reasons, I am unable to provide any notice. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Download Minnesota Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. Resignation letters shoulf always be polite. They should have no negative or critical feedbacks. Learn how to write a professional resignation letter with concise tips and examples. I want to resign immediately. The employer wanted me to stay 3 more weeks, before I mentioned any of this mental health information.