我们将企业邮箱设置在客户端或者手机端上时，经常会遇到POP和IMAP协议让用户选择，这两个协议有什么不同呢？设置不同的协议会给我们的工作带来什么样的后果呢？

POP协议：
设置为POP协议模式：客户端/手机端只下载网页上收件箱中的邮件，其它文件夹的邮件不会被下载。
在客户端上发送的邮件，也不会同步到邮箱网页端上面。
POP协议下客户端上看到的邮件是本地电脑文件，pop模式下客户端新建的文件夹，不会出现在邮箱网页端上，等同于在电脑上新建文件一样，邮件都保存在本地电脑中，网页上的邮件删除不影响客户端/手机端上已存在的邮件，客户端/手机端上的邮件删除，也不会影响网页端上已经存在的邮件；
POP3协议与POP协议相同。

IMAP协议：
设置为IMAP协议模式：客户端/手机端，网页上所有的文件夹及邮件客户端完全同步。
网页端，电脑客户端，手机端不管收件箱还是发件箱所有的数据都是同步的，方便移动办公。
一个终端上的邮件被删除或者移动，其它终端上的邮件会被同步删除或者移动。
（从品牌邮箱网的服务经验看，如果一个邮箱帐号有多个人同时使用，不推荐使用此协议）

When we set up enterprise email on the client or mobile end, we often encounter POP and IMAP protocols for users to choose from. What are the differences between these two protocols? What are the consequences of setting different protocols for our work?

POP protocol:

Set to POP protocol mode: The client/mobile end only downloads emails from the inbox on the webpage, and emails from other folders will not be downloaded.

Emails sent on the client will not be synchronized to the email webpage.

Under the POP protocol, the emails seen on the client are local computer files. In POP mode, newly created folders on the client will not appear on the email web page, just like creating files on the computer. Emails are saved on the local computer. Deleting emails on the web page does not affect existing emails on the client/mobile end, and deleting emails on the client/mobile end does not affect existing emails on the web end;
The POP3 protocol is the same as the POP protocol.

IMAP protocol:

Set to IMAP protocol mode: client/mobile, all folders and email clients on the webpage are fully synchronized.

On the web, computer, and mobile platforms, all data in both the inbox and inbox are synchronized, making it convenient for mobile office work.

If an email on one terminal is deleted or moved, emails on other terminals will be synchronously deleted or moved.

Based on the service experience of ppmail.com.cn, it is not recommended to use this protocol if multiple people are using an email account at the same time