使用mutt＋exim4+fetchmail出现的问题

yoyocall

我设置好之后正常用了一段时间，可是最近老出问题，会经常收到这样的邮件：
邮件名：30   + Aug 12 MAILER-DAEMON@gucas.ac.cn (  27) failure notice
内容为：
Date: 12 Aug 2009 16:59:09 +0800
From: MAILER-DAEMON@gucas.ac.cn
To: birdcai@gucas.ac.cn
Subject: failure notice

Hi. This is the qmail-send program at gucas.ac.cn.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<root@gucas.ac.cn>:
Sorry, no mailbox here by that name. (#5.1.1)

--- Below this line is a copy of the message.

Return-Path: <birdcai@gucas.ac.cn>
Received: (qmail 29780 invoked by uid 507); 12 Aug 2009 16:38:36 +0800
Received: from unknown (HELO mydebian) (10.2.1.16)
  by gucas.ac.cn with AES256-SHA encrypted SMTP; 12 Aug 2009 16:38:36 +0800
Received: from birdcai by mydebian with local (Exim 4.69)
        (envelope-from <birdcai@gucas.ac.cn>)
        id 1Mb8ty-0008FF-Ix
        for root@gucas.ac.cn; Wed, 12 Aug 2009 16:09:42 +0800
To: root@gucas.ac.cn
Auto-Submitted: auto-generated
Subject: *** SECURITY information for mydebian ***
From: birdcai <birdcai@gucas.ac.cn>
Message-Id: <E1Mb8ty-0008FF-Ix@mydebian>
Date: Wed, 12 Aug 2009 16:09:42 +0800

mydebian :  8月 12 16:09:42 : birdcai : ^C

请高手指教