It allows mail-processing agents (such as a POP server) to distinguish between mail messages that are generated by older versions and new versions.

它应用邮件处理代理(例如一个POP服务器)来区别旧版本和新版本所生成的邮件消息。

youdao

Moreover, the password needed for authentication is also transmitted as plaintext when a connection to POP server is established, which may result in the stealing and divulging of the email.

另外在连接服务器(pop)时，传送的验证密码也是以明文形式传送的，同样容易引起密码的泄露，最终导致邮件被盗、泄密等。

youdao

Here, you must select "POP" instead of "IMAP" for the incoming server.

这里，你必须选择“POP”而不是“IMAP”作为收入的服务器。

youdao