Internet Technologies 简明教程

E-mail Features

当前，邮件客户端经过改进，新增了附件、地址簿和 MIME 支持等功能。在本章中，我们将讨论所有这些功能，帮助您更好地了解邮件客户端程序新增功能。

Now a day, the mail client comes with enhanced features such as attachment, address book, and MIME support. Here in this chapter we will discuss all of these features which will give you a better understanding of added feature of a mail client program.

Attachment

能够将文件附加到邮件是电子邮件最有用的功能之一。这个附件可能是 word document, PowerPoint presentation, audio/video files, 或 images.

Ability to attach file(s) along with the message is one of the most useful features of email. The attachment may be a word document, PowerPoint presentation, audio/video files, or images.

  1. In order to attach file(s) to an email, click the attach button. As a result, a dialog box appears asking for specifying the name and location of the file you want to attach.

  2. Once you have selected the appropriate file, it is attached to the mail.

  3. Usually a paper clip icon appears in the email which indicates that it has an attachment.

  4. When adding an attachment it is better to compress the attached files so as to reduce the file size and save transmission time as sending and downloading large files consumes a lot of space and time.

Address Book

邮件程序的地址簿功能使用户能够存储通过发送电子邮件定期进行交流的人员的信息。以下是一些地址簿的主要功能：

Address book feature of a mail program allows the users to store information about the people whom they communicate regularly by sending emails. Here are some of the key features of an Address book:

  1. Address book includes the nick names, email addresses, phone number etc. of the people.

  2. Using address book allows us not to memorize email of address of a person, you just have to select recipient name from the list.

  3. When you select a particular name from the list, the corresponding email address link automatically get inserted in to the To: field.

  4. Address book also allows creating a group so that you can send a email to very member of the group at once instead of giving each person email address one by one.

MIME Types

MIME 是 Multipurpose Internet Mail Extensions. 的缩写，兼容 MIME 的邮件程序使我们能够发送除简单文本之外的其他文件，即允许我们将音频、视频、图像、文档和 PDF 文件作为附件发送到电子邮件中。

MIME is acronym of Multipurpose Internet Mail Extensions. MIME compliant mailer allows us to send files other than simple text i.e. It allows us to send audio, video, images, document, and pdf files as an attachment to an email.

假设您想发送一个具有复杂格式的一组表格列的文字处理文档。如果我们将文件作为文本传输，所有格式都可能会丢失。兼容 MIME 的邮件程序会处理所有混乱的细节，信息会按照期望的那样到达。

Suppose if you want to send a word processor document that has a group of tabular columns with complex formatting. If we transfer the file as text, all the formatting may be lost. MIME compliant mailer takes care of messy details and the message arrives as desired.

下表介绍了常用的 MIME 类型：

The following table describes commonly used MIME Types:

1.

Type

Subtype

Description

File extension(s)

2.

Application

postscript tex troff

Printable postscript document TEX document Printable troff document

.eps, .ps .tex .t, .tr, .roff

3.

Audio

aiff au midi real audio

Apple sound Sun Microsystems sound Musical Instrument Digital Interface Progressive Network sound

.aif, .aiff,.aifc .au, .snd .midi, .mid .ra, .ram

4.

image

gif jpeg png triff

Graphics Interchange Format Joint Photographic Experts Group Portable Network Graphics Tagged Image Modeling Language

.gif .jpeg, .jpg, .jpe .png .tiff, .tif

5.

Model

vrml

Virual reality Modelling Language

.wrl

6.

Text plain sgml

html

Hyper Text Markup Language Unformatted text Standard Generalized Markup language

.html, .htm .txt .sgml

7.

Video

avi mpeg quicktime sgi-movie

Microsoft Audio Video Interleaved Moving Pictures Expert Group Apple QuickTime movie silicon graphic movie

.avi .mpeg, .mpg .qt, .mov .movie