使用电子邮件作为一种发送通信但有实例,我们需要在我们的邮件附加文件等文件,pdf文件,文档文件、图片、声音、文本文件或源代码实例。-Use e-mail as a communication sent, but there are instances, we need our mailing additional files and other documents, pdf files, document files, images, sounds, text files or source c