关于squirrelmail的问题,帮帮忙阿

blueriver

我是redhat8.0,squirrelmail,1.2.10
why???????
谁能帮我解释一下(reason: 553 5.5.4 <test@localhost.localdomain>... Real domain name required for
sender address)
怎么出现这个呢?
错误如下



The original message was received at Wed, 30 Apr 2003 23:36:36 +0800
from apache@localhost

----- The following addresses had permanent fatal errors -----
<xasdas@163.com>
(reason: 553 5.5.4 <test@localhost.localdomain>... Real domain name required for
sender address)
(expanded from: <xasdas@163.com>)
<test@xxx.org>
(reason: 553 5.5.4 <test@localhost.localdomain>... Real domain name required for
sender address)
(expanded from: <test@xxx.org>