谁知道vip.163.com返回551 User not local,pls try 的原因

lotuslab

用户发送邮件到vip.163.com,结果返回如下信息：（那位能告知是什么原因？）<br>
Your message <br>
Subject: "MSDS"<br>
could not be delivered to some or all of the intended recipients.<br>
<br>
<br>
User<fiona-scaclogi@vip.163.com> - (551 User not local; please try <forward-path>)<br>

smallbigbox

到服务器上测试一下先