If the list is empty, the number of waiting threads is incremented and the current thread is blocked.
如果列表为空，就会增加等待线程的数量，并阻塞当前线程。
2
Click Yes to confirm the email address to be removed from the Blocked Senders list.
单击Yes以确认将要从Blocked Senders列表中移除邮件地址。
3
If a domain name is reregistered to a legitimate company after you add the domain to your Blocked Senders list, you will unintentionally block legitimate messages.