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Linux认证系统管理：linuxmail命令发送邮件失败
使用linux自带的邮件功能测试邮件发送功能如下：
$ mail -s test xxx@163.com
sldkfjlskdjf[CTRL+D]
cc:
有时会出再提示:
You have a new mail in /var/spool/mail/root
并且在邮箱中看不到邮件;
解决办法:
1.查看出错的日志
$ tail -n 50 /var/spool/mail/root
From MAILER-DAEMON@ltv_73 Thu Dec 12 11:35:28 2013
Return-Path:
Received: from localhost (localhost)
by ltv_73 (8.13.8/8.13.8) id rBC3ZSPe006446;
Thu, 12 Dec 2013 11:35:28 +0800
Date: Thu, 12 Dec 2013 11:35:28 +0800
From: Mail Delivery Subsystem
Message-Id: <201312120335.rBC3ZSPe006446@ltv_73>
To:
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="rBC3ZSPe006446.1386819328/ltv_73"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
This is a MIME-encapsulated message
--rBC3ZSPe006446.1386819328/ltv_73
The original message was received at Thu, 12 Dec 2013 11:35:18 +0800
from 41_154 [127.0.0.1]
----- The following addresses had permanent fatal errors -----
(reason: 530 5.7.1 Client was not authenticated)
----- Transcript of session follows -----
...while talking to mail.163.com.:
>>> MAIL From: SIZE=519
<<< 530 5.7.1 Client was not authenticated
554 5.0.0 Service unavailable
--rBC3ZSPe006446.1386819328/ltv_73
Content-Type: message/delivery-status
Reporting-MTA: dns; ltv_73
Received-From-MTA: DNS; sohu_41_154
Arrival-Date: Thu, 12 Dec 2013 11:35:18 +0800
Final-Recipient: RFC822; xxx@163.com
Action: failed
Status: 5.7.1
Diagnostic-Code: SMTP; 530 5.7.1 Client was not authenticated
Last-Attempt-Date: Thu, 12 Dec 2013 11:35:28 +0800
2.修改DNS
$ vim /etc/resolv.conf
修改成可用的DNS，这个地方的修改保存后即生效;
3.修改主机名【也可不做这一步】
$ sysctl kernel.hostname=newhostname
4.重启邮件服务
$ service sendmail restart
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