Email Design is a quick, low-cost, and dependable method of communication. It is not always time-sensitive, unlike other types of communication. If you take a few minutes to react to a question on the phone or in a chat, for example, a consumer will become impatient. If you're communicating via email, you have the luxury of taking your time to formulate a response. In most cases, responding to an email within hours, rather than minutes or seconds, is appropriate.