Exchange 不能外发邮件？

jackhotmail

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每次发到163都出现下面的提示：<br>
Your message<br>
<br>To: sunyesy@163.com<br>Subject: sffs<br>Sent: Tue, 30 May 2006 09:13:29 +0800<br>
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did not reach the following recipient(s):<br>
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sunyesy@163.com on Tue, 30 May 2006 09:05:57 +0800<br><br>
收件人电子邮件服务器出现 SMTP 通信问题。请与系统管理员联系。