求助sendmail 收不到邮件

ncist2011

我用 /usr/sbin/sendmail -s 'test' ncist2011@163.com < /tmp/test.log
想把 test.log 内容发送至 163邮箱，但是收件箱没有收到

在/var/mail/root 里查看有test.log 的内容信息

From MAILER-DAEMON Wed Aug  6 14:41:33 2014
Return-Path: <MAILER-DAEMON@UA4300D-spa.local>
Received: from localhost (localhost)
        by UA4300D-spa.local (8.14.4+Sun/8.14.4) id s766fXFn133683;
        Wed, 6 Aug 2014 14:41:33 +0800 (CST)
Date: Wed, 6 Aug 2014 14:41:33 +0800 (CST)
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <201408060641.s766fXFn133683@UA4300D-spa.local>
To: <root@UA4300D-spa.local>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="s766fXFn133683.1407307293/UA4300D-spa.local"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
Content-Length: 1495

This is a MIME-encapsulated message

--s766fXFn133683.1407307293/UA4300D-spa.local

The original message was received at Wed, 6 Aug 2014 14:41:33 +0800 (CST)
from localhost [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<ncist2011@163.com>

   ----- Transcript of session follows -----
550 5.1.2 <ncist2011@163.com>... Host unknown (Name server: mailhost.local: host not found)

--s766fXFn133683.1407307293/UA4300D-spa.local
Content-Type: message/delivery-status

Reporting-MTA: dns; UA4300D-spa.local
Received-From-MTA: DNS; localhost
Arrival-Date: Wed, 6 Aug 2014 14:41:33 +0800 (CST)

Final-Recipient: RFC822; ncist2011@163.com
Action: failed
Status: 5.1.2
Remote-MTA: DNS; mailhost.local
Last-Attempt-Date: Wed, 6 Aug 2014 14:41:33 +0800 (CST)

--s766fXFn133683.1407307293/UA4300D-spa.local
Content-Type: message/rfc822

Return-Path: <root@UA4300D-spa.local>
Received: from UA4300D-spa.local (localhost [127.0.0.1])
        by UA4300D-spa.local (8.14.4+Sun/8.14.4) with ESMTP id s766fXFn133681
        for <ncist2011@163.com>; Wed, 6 Aug 2014 14:41:33 +0800 (CST)
Received: (from root@localhost)
        by UA4300D-spa.local (8.14.4+Sun/8.14.4/Submit) id s766fXGE133678
        for ncist2011@163.com; Wed, 6 Aug 2014 14:41:33 +0800 (CST)
Date: Wed, 6 Aug 2014 14:41:33 +0800 (CST)
From: Super-User <root@UA4300D-spa.local>
Message-Id: <201408060641.s766fXGE133678@UA4300D-spa.local>
To: ncist2011@163.com
Subject: testsubject

ncist2011

--s766fXFn133683.1407307293/UA4300D-spa.local--



这是什么原因？如何能实现向163邮箱发送邮件，谢谢