Electronic mail，or E-mail，is a method of transmitting message through a computer network. Business communication by E-mail is basically the same as writing on paper. Although E-mail tends to be a more immediate and personal form. of communication，the formal style，tone and language of a business letter should still be employed. Try to avoid long and complicated words and sentences in your E-mail as to make the message easy to read. Keep paragraphs short and use line spaces between paragraphs.