SMTP Service does not work with status code 4.3.1 when sending message using Telnet

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This article was previously published under Q276326

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SYMPTOMS

When you use telnet to send a message to port 25 of the Windows 2000 Simple Mail Transfer Protocol (SMTP) service, the service may return a status code of "4.3.1 Out of Memory" after the data command is sent.

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CAUSE

This issue can occur if the System account does not have sufficient permissions to write the message to the proper folder. By default, the System account has sufficient permissions, but if an administrator modifies NTFS file system (NTFS) security permissions, the administrator may inadvertently affect mail flow.

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RESOLUTION

To resolve this issue, grant the System account full control permissions to the Mailroot folder and the Mailroot folder's subfolders.

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MORE INFORMATION

For more information about troubleshooting the "4.3.1 Out of Memory" error message in Exchange Server, click the following article number to view the article in the Microsoft Knowledge Base:

329167 (http://support.microsoft.com/kb/329167/ ) Troubleshooting "452 4.3.1 Out of Memory" error message

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