I will hopefully be leaving my current job within the next few weeks. I am a field tech and my bosses are ten hours away. Because of the distance, I can not quit face to face and hand them a resignation letter. I have the resignation letter written already with the dates being the only thing I have to add. In this case would it be acceptable to email this to my bosses followed by a phone call? I was thinking about emailing it along with faxing or snail mailing a signed hard copy. I want to leave on good terms incase I need a recommendation and to not burn a bridge.