SMTP: 550 Huh? Extended HELO (EHLO) Not Supported

The information in this article applies to:

• Microsoft Mail Gateway to SMTP, version 3.0

SYMPTOMS

Version 3.0 of Microsoft Mail Gateway to SMTP does not accept the extended hello greeting (EHLO). If a host contacts the SMTP gateway computer with "EHLO" instead of "HELO," the gateway replies with a "550 Huh?" and promptly closes the connection so the host can't send the standard "HELO."

STATUS

Microsoft has confirmed this to be problem in version 3.0 of Microsoft Mail Gateway to SMTP. This problem was corrected in version 3.0.2 of SMTPGATE.EXE. If you do not have version 3.0.2 (or later), you can obtain the latest version from the Microsoft Software Library (MSL). Download SMTPGW.EXE (S14223), a self-extracting file, from any of the following services:

• Microsoft's World Wide Web Site on the Internet

        On the www.microsoft.com home page, click the Support icon.
        Click Knowledge Base, and select the product.
        Enter kbfile SMTPGW.EXE (size: 231849 bytes) 
                               , and click GO!
        Open the article, and click the button to download the file.
  
  

• Internet (anonymous FTP)

        ftp ftp.microsoft.com
        Change to the Softlib/Mslfiles folder.
        Get SMTPGW.EXE (size: 231849 bytes) 
  

• The Microsoft Network

        On the Edit menu, click Go To, and then click Other Location.
        Type "mssupport" (without the quotation marks).
        Double-click the MS Software Library icon.
        Find the appropriate product area.
        Locate and Download SMTPGW.EXE.
  

• Microsoft Download Service (MSDL)

        Dial (206) 936-6735 to connect to MSDL
        Download SMTPGW.EXE (size: 231849 bytes) 
  

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online
               Services