This article was previously published under Q292768
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When a Windows 2000-based Simple Mail Transfer Protocol (SMTP) server is receiving mail from Sendmail version 8.11 or later, the server may return a fatal error.
This behavior occurs because when Sendmail version 8.11 or later is configured with outbound authentication credentials, it sends AUTH= on the MAIL FROM command line if the sender has been authenticated. However, a Windows 2000-based SMTP server does not support the AUTH= parameter on the MAIL FROM SMTP command line.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
This problem was first corrected in Windows 2000 Service Pack 2.