Guerrillamail.com from the Netherlands provides us with one-time email service. That is to say, within the limited 15 minutes, you can use a temporary email address to send and receive emails. After the time limit, the email will become invalid and you will never receive any junk mail. Moreover, it is environmental-friendly. The email address will truly disappear, unlike the temporary one I registered before which will exist forever and cause the pollution of digital garbage.