Article ID: 194850 - View products that this article applies to.
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This article applies to Microsoft Mail Server. Microsoft Commercial Internet System (MCIS) 2.0 SMTPSVC running on a Windows NT 4.0 SP3 computer fails to strip the BCC information for outgoing SMTP messages.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed this to be a problem in Microsoft Commercial Internet System version 2.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
Most e-mail clients hide the BCC information when a message is submitted; however, there are a few clients that do not hide this information. Therefore, in a few cases there is the potential for the MCIS 2.0 IMS to send messages containing the BCC address information when the MCIS 2.0 server resides on a Windows NT 4.0 SP3 computer.