用户可以利用某个网站的pop3电子邮件接收服务器来接收你在该网站的电子邮箱里的信件。实例只介绍了接收邮件，提取信头标题字段的有关内容，能正确显示符合Rfc822规范的邮件。-Users can use a pop3 mail server of website to receive your e-mail on the site. Examples are introduced only receive messages and extract the relevant header field