Microsoft KB Archive/231429

= XFOR: Can Send But Cannot Receive Inbound Internet Mail =

Article ID: 231429

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q231429



SYMPTOMS
When you use the Exchange Server Internet Mail Service, you can send Internet mail but you cannot receive it.



CAUSE
This issue can occur if the Simple Mail Transfer Protocol (SMTP) Service from the Microsoft Windows NT 4.0 Option Pack has been installed.



RESOLUTION
To resolve this issue, open Control Panel, double-click Services, and then disable the SMTP Service.



MORE INFORMATION
The SMTP Service is an optional service which can be installed when you install Microsoft Internet Information Server (IIS) 4.0. Do not install the SMTP Service when you install IIS on an Exchange Server computer. IIS is required by Outlook Web Access (OWA); during IIS installation, the SMTP Service may be installed by mistake.

The Internet Mail Service needs exclusive use of TCP port 25 to successfully transport SMTP mail. If another program reserves port 25, the Internet Mail Service may start successfully, but incoming mail may not be accepted. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

146157 XFOR: Should Have Exclusive Access to Port 25

Keywords: kbprb KB231429

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