As the earliest tool of internet, E mail is the most economical and practical tool. User may enter the resource of internet by E mail if he does not connect directly with internet and only connects with BBS and has the right of UUCP.

• 电子邮件（E－mail）作为Internet最早的工具，也是最经济、最实惠的工具，如果用户没有直接联到Internet网，而只是通过BBS或仅具有UUCP的权限，也可以通过E－mail去进入任何Internet资源。