Microsoft KB Archive/108054

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Knowledge Base

SMTP: Err Msg: Error <Address> Is an Invalid Courier Mailbox

Article ID: 108054

Article Last Modified on 10/30/2006


  • Microsoft Mail Gateway to SMTP 3.0

This article was previously published under Q108054


Version 3.0 of Microsoft Mail Gateway to SMTP generates non-delivery notices, and reports the following error message:

ERROR <address> is an invalid Courier Mailbox
ERROR Translating message to Microsoft Mail: out of memory
552 Error in local delivery


The gateway received an invalid Microsoft Mail mailbox in the RFC 822 header information.


Microsoft has confirmed this to be problem in version 3.0 of Microsoft Mail Gateway to SMTP. This problem was corrected in version 3.0.8 of SMTPGATE.EXE. If you do not have version 3.0.8 (or later), you can obtain the latest version from the Microsoft Download Center. 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 home page, click the Support icon.
    Click Knowledge Base, and select the product.
    Enter kbfile SMTPGW.EXE, and click GO!
    Open the article, and click the button to download the file.

  • Internet (anonymous FTP)

    Change to the Softlib/Mslfiles folder.

  • The Microsoft Network

    On the Edit menu, click Go To, and then click Other Location.
    Type mssupport.
    Double-click the MS Software Library icon.
    Find the appropriate product area.
    Locate and Download SMTPGW.EXE.

For additional information about downloading, please see the following article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services


Even if the recipient (RCPT) specified in the RFC 821 part of the message is accurate, the gateway still fails the message if it cannot match the RFC 822 To: fields to a Microsoft Mail user.

Additional query words: 3.00

Keywords: KB108054