退回信件

[changhh]

站長您好:
我寄信到很多信箱,都會退回,而出現以下2種訊息,請幫幫我解答一下

1種
The original message was received at Wed, 28 Apr 2004 11:56:14 +0800
from [210.61.142.8]

----- The following addresses had permanent fatal errors -----
<tonysun@8tec.com>
(reason: 550 5.1.1 <tonysun@8tec.com>... User unknown)

----- Transcript of session follows -----
... while talking to mails.stonetech.com.tw.:
>>> DATA
<<< 550 5.1.1 <tonysun@8tec.com>... User unknown
550 5.1.1 <tonysun@8tec.com>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)


2種

Response Message :
To: roland@accesstek.com.tw
Subject: HomeTech
Reason: 550 5.1.1 <roland@accesstek.com.tw>... User unknown

[George]

User Unknow...
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