A. 打开来历不明的电子邮件附件可能会传染计算机病毒
B. 在网络拥塞的情况下，发送电子邮件后，接收者可能过几个小时后才能收到
C. 在试发电子邮件时，可向自己的Email邮箱发送一封邮件
D. 电子邮箱的容量指的是用户当前使用的计算机上，分配给电子邮箱的硬盘容量
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