如何从发件箱收到电子邮件（邮件发送给某人）以及如何在使用pop3时检查电子邮件的未读属性
问题描述：
我使用pop3从gmail获取邮件，但不知道如何检查电子邮件的未读属性。
以及如何发送邮件（发件箱内的邮件）？
i using pop3 to get mails from gmail, but don't know how to check unread property of a email.
and how to get mails had send (mail inside outbox)?
答
已发送邮件等是由特定邮件客户端实现的存储文件夹，因此Outlook将以不同于Hotmail或gmail等的方式存储它们，并且pop3不能用于访问文件夹，只邮件等待处理的项目。同上所读的内容，由客户端管理。要访问文件夹，您将不得不使用IMAP，这是一种更高级的协议，用于访问包含文件夹概念的邮件。
Sent Items etc are storage folders implemented by the specific mail client, so Outlook will store them differently from Hotmail, or gmail etc, and pop3 can't be used to access folders, only mail items waiting to be processed. Ditto what has been read, that is managed by the client. To access folders you're going to have to use IMAP which is a more advanced protocol for accessing mail that includes the concept of folders.