The third line of a.procmailrc rule can name a mailbox where the message should be forwarded, but this recipe does something more interesting.
procmailrc规则的第三行可以命名应该转发此邮件的邮箱，但这条规则所做的事更加有趣。
As its name implies, MailBox is essentially the Drop by itself, a single-slot buffer that holds a piece of data until it has been retrieved.
顾名思义，MailBox从本质上说就是Drop，用于在检测之前保存数据块的单槽缓冲区。
A tiger's scratch marks on a tree are like a name on a mailbox.
老虎留在树上的抓痕就像邮箱上的名字一样。
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