Negotiating online is different from communicating in person. First of all, it is not done in real time. Communicating online is by definition a delayed process. One party sends an email and then waits for a response. Since you cannot see or hear the other person, you are getting all your cues from the online message. Because you are typing and thinking at the same time, it is easy to make mistakes which only get noticed after you have already sent it. Here are five rules that apply to negotiating via email.