While POP3 is the current standard for e-mail that is sent to clients, IMAP4 is more flexible for users such as those who access their mail using different computers.

• POP3是被送给用户端的电子邮件的目前标准，不过IMAP4对使用不同的计算机存取他们的邮件的使用者，像是人是更有柔性的。