邮件发给对方，都退了回来，如何处理？
请教大家，怎样找出原因，并处理是最好的方法？ 贴日志以及退信看看问题是出在哪里
补上日志和邮件头，请各位大大帮忙看看！
Hi. This is the deliver program at richinfo.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.
ming@rococo-vision.com
553 authentication is required
--- Attachment is a copy of the message.
[这是服务器 richinfo.cn 的投递程序返回的提示信息]
到下列地址的信件投递失败，对方服务器无法正常接受或者拒绝接受这封邮件，
这是一个永久性的错误，服务器已经放弃继续投递。
ming@rococo-vision.com
对方服务器返回错误提示:
553 authentication is required
--
[附件是您所发送信件的原件]
-------邮件头-----------
X-Kaspersky: Checking
X-Kaspersky: Checking
Received: (eyou send program); Wed, 17 Dec 2008 11:23:12 +0800
Received: (EYOU MTA SYSTEM 29430 invoked for bounce); Wed, 17 Dec 2008 11:23:12 +0800
EYOU-RETURN-TO-SENDER: yjy@ycmail.cn
Date: Wed, 17 Dec 2008 11:23:12 +0800
From: <MAILER-DAEMON@richinfo.cn>
To: <yjy@ycmail.cn>
Subject: [!! SPAM]failure notice
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350
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