Knowledge Base

XFOR: Internet Mail Service Rejects Messages Sent with 7- Bit Encoding

Article ID: 182917

Article Last Modified on 10/28/2006

Microsoft Commercial Internet System 1.0 Service Pack 2

This article was previously published under Q182917

SYMPTOMS

This article applies to Microsoft Internet Mail Service. As specified in RFC 1652, the MCIS Internet Mail Server rejects mail messages from a foreign SMTP mail host with a 7-bit message body. In accordance with RFC 1652, a mail message with the following encoding:

   MAIL FROM:<user's email address> BODY=7BIT

is rejected by the MCIS Internet Mail Server with the following error message:

553 Unrecognized command.

NOTE: The mail message is never sent.

WORKAROUND

Configure the foreign SMTP mail host to use 8-bit MIME instead of 7-bit message body encoding.

STATUS

Microsoft has confirmed that this is a problem in Microsoft CommercialInternet System, version 1.0 Service Pack 2.

A supported fix is now available, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Additional query words: prodmcis1 prodIMS

Keywords: kbbug kbfix kbqfe KB182917