SMTP Returns an NDR on MX Records with an IP Address Instead of an A Record (275178)

SYMPTOMS

When you attempt to send Simple Mail Transfer Protocol (SMTP) messages to certain domains, the attempts do not work and you receive a non-delivery report (NDR).

CAUSE

This problem occurs only when you attempt to send SMTP messages to domains in which the MX record in Domain Name System (DNS) is configured with a numeric Internet Protocol (IP) address rather than a host record.

RESOLUTION

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 the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English-language version of this fix should have the following file attributes or later:

   Date     Time    Version        Size     File name
   ----------------------------------------------------
   9/27/00  5:30pm  5.0.2195.2345  381,200  Smtpsvc.dll
   9/27/00  2:25pm  5.0.2195.2345  234,768  Seo.dll

STATUS

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.

MORE INFORMATION

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes