你好，
根據我的研究，你很大可能打開了 SMTP Relay.
你可以試試以下 Microsoft 文件，打你的 SMTP Relay 設限 :
http://technet.microsoft.com/en-us/kb/kb.aspx?id=324958
Configure the Exchange Server to block open SMTP relaying
To check the properties on the Default SMTP Virtual Server, follow these steps:
-
Click Start, click All Programs,
click Microsoft Exchange, and then click System
Manager.
-
Expand Servers, expand Servername,
expand Protocols, and then expand SMTP.
If the server is an upgrade from Small Business Server 4.x, expand Administrative Groups, expand Servername,
expand Servers, expand Servername,
expandProtocols, expand SMTP.
-
Right-click Default SMTP Virtual Server and then click Properties.
-
Click the Access tab.
-
Click the Relay button at the bottom.
-
The default settings block open relay. The default settings are as follows:
- Select Only the list below.
- The Computers dialog box shows Access Granted to the Internal IP address of the Small Business Server network and to the
external IP address (if the server has more than one network card.)
- Make sure that Allow all computers which successfully authenticate to relay, regardless of the list above is selected.
-
Set the Default SMTP Virtual Server configuration for relaying as indicated, which restores its settings to their defaults.
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如果你已知有其他設備需要使用 (例如：影印機)
可以特別輸入他的地址。否則應關閉不必要服務。
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以上的文件可以幫你解決燃眉之急。
但為有效預防問題，你應該參考另一文件
http://technet.microsoft.com/zh-cn/kb/kb.aspx?id=319356
How To prevent unsolicited commercial e-mail in Exchange 2000 Server
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