大量退信问题
大虾们，今天碰到一个奇怪的问题突然性收到一大批退信
但是都是几天甚至半个月前发的信件的退信，其实是已经发出去了的
就算没发出去，也不至于过了这么长时间才有退信回来吧
请帮帮忙！
谢谢了 系统里面应该有设置多久退信 Your message did not reach some or all of the intended recipients.
Subject: RE: 资料 杨艳
Sent: 2007-4-16 16:40
The following recipient(s) could not be reached:
'zhangqin' on 2007-5-10 10:12
The e-mail system was unable to deliver the message, but did not report a specific reason.Check the address and try again.If it still fails, contact your system administrator.
<xxx.xxx.com.cn #4.0.0 smtp;451 <dept6@999.shteol.com>... Requested mail action not taken: mailbox unavailable>
现在弄明白了，不知道是不是中毒了
这是之前我一个朋友给我发的邮件2007-4-16， 我根本没回信，也没联系过他
系统怎么会有退信呢！
所以我觉得很奇怪！
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