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【单选题】
●采用SMTP协议和POP协议的服务器功能都是通过Internet实现邮件通信，它们在功能上的区别是 (53) 。 (53)A.
SMTP邮件服务器接收来自任意发送方的消息，而POP服务器只有在用户输入正确的身份消息后，才允许对邮箱进行存取
B.
SMTP邮件服务器只有在用户输入正确的身份消息后，才允许对邮箱进行存取，而POP服务器接收来自任意发送方的消息
C.
SMTP邮件服务器和POP服务器只有在用户输入正确的身份消息后，才允许对邮箱进行存取
D.
以上都不对
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