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

Article ID: 108054

Article Last Modified on 10/30/2006

APPLIES TO

- Microsoft Mail Gateway to SMTP 3.0

This article was previously published under Q108054

## SYMPTOMS

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

## CAUSE

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

## STATUS

Microsoft has confirmed this to be problem in version 3.0 of Microsoft Mail Gateway to SMTP. This problem was corrected in version 3.0.8 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 www.microsoft.com 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)

  ftp ftp.microsoft.com
  Change to the Softlib/Mslfiles folder.
  Get SMTPGW.EXE

- 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

## MORE INFORMATION

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