以下关于电子邮件服务的说法中，正确的是（ ）。
- A.收到的邮件会即时自动的存储在预定目录中
- B.电子邮件需要用户手动接收
- C.不同操作系统使用不同的默认端口
- D.电子邮件地址格式允许用户自定义
正确答案及解析
正确答案
A
解析
电子邮件服务器在收到用户发过来的新邮件时，会自动地存储在用户注册邮箱等邮件目录，待用户登录邮件服务器时，用户在从服务器中对应的目录上下载相应的邮件。
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