Nowadays, technology becomes a part of life. People try to develop technology to improve life. Therefore, technology contributes to convenience in daily life. Most people adapt to their work to make it easier, for example by using email and other messaging programs to communicate in their work. There are many benefits of today's technology to support work. However, if people use them improperly, these technologies are not beneficial to either employees or employers. There are two reasons why employees should not be available via email or other messaging services after hours; protect the mental health of employees and enhance the worker's private time. Protecting the worker's mental health is the first reason to oppose off-site working. Today, workers spend more than 8 hours a day in the office. Some workers not only work during business hours, but also work overtime to finish their project that day before getting another job tomorrow. It seems that workers tend to have too much stress. If workers had to face overloaded work every day, this would happen in the long run ...