为什么centos7没有~/mbox这个目录?

鸟哥说用mail查看过的邮件会转移到~/mbox这个目录中,可以用mail -f mbox查看,为什么本机就没有这个目录呢?

& 2
Message  2:
From none@localhost.localdomain  Mon Jan 26 00:05:48 2015
Return-Path: <none@localhost.localdomain>
X-Original-To: root@localhost.localdomain
Delivered-To: root@localhost.localdomain
Date: Mon, 26 Jan 2015 00:05:48 -0800
To: root@localhost.localdomain, none@localhost.localdomain
Subject: Re: 112
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
From: none@localhost.localdomain (centos)
Status: RO

root@localhost.localdomain (root) wrote:

> iesgebl
q

& q
Held 3 messages in /var/spool/mail/root
[root@localhost ~]# mail -f mbox
mbox: No such file or directory
[root@localhost ~]#