解决linux下创建用户时出现 Creating mailbox file: 文件已存在

原来linux下添加用户后,会在系统里自动加一个邮箱(系统邮箱),路径是:/var/spool/mail/用户名.
      可以直接用命令#rm -rf /var/spool/mail/用户名
      这样就可以再次添加同一名字的用户.

解决You have new mail in /var/spool/mail/root提示

终端远程登陆后经常提示You have new mail in /var/spool/mail/root

这个提示是LINUX会定时查看LINUX各种状态做汇总，每经过一段时间会把汇总的信息发送的root的邮箱里，以供有需之时查看。

一般这种情况mail的内容就只是一些正常的系统信息或者是比较重要的错误报告。

如果你安装了mutt的话直接用这个命令就可以查看mail的内容（用root登陆先），没有装的话用cat /var/spool/mail/root查看（用root登陆先）。

查看内容：

[root@tan ~]# cat /var/spool/mail/root
From root@tan.localdomain  Wed May   ::
Return-Path: <root@tan.localdomain>
X-Original-To: root
Delivered-To: root@tan.localdomain
Received: by tan.localdomain (Postfix, from userid )
    id AD13C101A70C; Wed,   May  :: + (CST)
To: root@tan.localdomain
From: tan@tan.localdomain
Auto-Submitted: auto-generated
Subject: *** SECURITY information for tan ***
Message-Id: <.AD13C101A70C@tan.localdomain>
Date: Wed,   May  :: + (CST)

tan : May   :: : tan : user NOT in sudoers ; TTY=pts/ ; PWD=/home/tan ; USER=root ; COMMAND=/sbin/useradd tan2

From root@tan.localdomain  Wed May   ::
Return-Path: <root@tan.localdomain>
X-Original-To: root
Delivered-To: root@tan.localdomain
Received: by tan.localdomain (Postfix, from userid )
    id F0D65101A70C; Wed,   May  :: + (CST)
To: root@tan.localdomain
From: tan@tan.localdomain
Auto-Submitted: auto-generated
Subject: *** SECURITY information for tan ***
Message-Id: <.F0D65101A70C@tan.localdomain>
Date: Wed,   May  :: + (CST)

tan : May   :: : tan : user NOT in sudoers ; TTY=pts/ ; PWD=/home/tan ; USER=root ; COMMAND=/sbin/useradd tan2

From root@tan.localdomain  Wed May   ::
Return-Path: <root@tan.localdomain>
X-Original-To: root
Delivered-To: root@tan.localdomain
Received: by tan.localdomain (Postfix, from userid )
    id C3BD8101A70C; Wed,   May  :: + (CST)
To: root@tan.localdomain
From: tan@tan.localdomain
Auto-Submitted: auto-generated
Subject: *** SECURITY information for tan ***
Message-Id: <.C3BD8101A70C@tan.localdomain>
Date: Wed,   May  :: + (CST)

tan : May   :: : tan : user NOT in sudoers ; TTY=pts/ ; PWD=/home/tan ; USER=root ; COMMAND=/sbin/useradd tan2

From root@tan.localdomain  Wed May   ::
Return-Path: <root@tan.localdomain>
X-Original-To: root
Delivered-To: root@tan.localdomain
Received: by tan.localdomain (Postfix, from userid )
    id 68249101A71A; Wed,   May  :: + (CST)
To: root@tan.localdomain
From: tan@tan.localdomain
Auto-Submitted: auto-generated
Subject: *** SECURITY information for tan ***
Message-Id: <.68249101A71A@tan.localdomain>
Date: Wed,   May  :: + (CST)

tan : May   :: : tan : user NOT in sudoers ; TTY=pts/ ; PWD=/etc ; USER=root ; COMMAND=/bin/cat sudoers

也可以设置把这个信息发送到管理员邮箱

日志分析工具 Logwatch能够对Linux 的日志文件进行分析，并自动发送mail给相关处理人员，可定制需求 Logwatch的mail功能是借助宿主系统自带的mail server发邮件的，系统需安装mail server , 如sendmail，postfix,Qmail等，具体配置不叙述

关闭提示：

[root@check1 ~]# echo "unset MAILCHECK">> /etc/profile
[root@check1 ~]# source /etc/profile

查看：

[root@check1 ~]# ls -lth /var/spool/mail/
total 49M
-rw-------  root mail 49M Jul  : root
-rw-rw----  nginx mail  May  : nginx
-rw-rw----  zabbix mail  May  : zabbix

清空：

[root@check1 ~]# cat /dev/null > /var/spool/mail/root

关闭提示：

1 2	[root@check1 ~]# echo "unset MAILCHECK">> /etc/profile [root@check1 ~]# source /etc/profile