Greetings and brief introduction of the courses.
Email is Electronic Mail. Email or electronic mail means to send or receive messages electronically. Email was invented by Ray Tomlinson, a computer engineer in late 1971.
Email, in today’s age has become one of the most widely used internet application. It is used frequently in our day to day life now as it is very simple to use. Most of the people in business, government and education prefer using email in comparison to conventional mail which is also known as snail mail for communicating with their colleagues. This unit just focuses on some knowledge about email. Let’s begin our study of this unit.
The following are the focal points that are needed to grasp.
    1. abbreviations in communication online
    2. email format
    3. email language features
    4. a sample of email
    5. information of online growth: Online Growth Continued
    6. noun clauses
                                              知识点一   什么是邮件
Email is a shorthand term meaning Electronic Mail. Email is much the same as a letter, only that it is exchanged in a different way. Email uses the SMTP protocol suite to send email messages via mail transfer agents. The first thing you need to send and receive emails is an email address. When you create an account with a Internet Service Provider; they usually provide customers with a free email address. If this isn't the case, then you can create an email address / account at web sites such as yahoo, hot-mail.
SMTP（Simple Mail Transfer Protocol）即简单邮件传输协议, protocol suite：协议组，协议套 Brief introduction of the unit
注意：
1、称呼后面的标点有三种选择：，（逗号）；。（句号）；空着。逗号不适用于正式场合，如公函，往来信件之类，
2、结尾问候语后面的标点，一般来讲，与称呼后面的标点一致。
3、每行字母是左对齐的，没有空两格（空两格是中文格式