Resignation letters shoulf always be polite. They should have no negative or critical feedbacks.I am resigning from Company effective immediately. Immediate resignation letter example. Briefly describe your experience. You can describe any negative experiences you've had that you feel are necessary to include. They are essential in helping you make sure you leave on positive terms with your employer. Stress often gets a bad rap, often for good reason. Customer: I have recently resigned from my employer due to hostile work environment. When resigning due to a toxic work environment, maintain professionalism.