SMTP: Err Msg: 503 Bad Command Sequence

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Article ID: 99855 - View products that this article applies to.
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Versions 2.1 and 3.0 of Microsoft Mail Gateway to SMTP may display this error message:
"503 Bad command sequence"


This error message indicates that an SMTP command was received out of sequence. After sending this error message to the calling host, the SMTP Gateway waits for another command.


Check the SMTPGATE.LOG file to find the offending command that caused the error. Then, contact the sending host to determine why the command was given.


Article ID: 99855 - Last Review: October 30, 2006 - Revision: 2.1
  • Microsoft Mail Gateway to SMTP 2.1
  • Microsoft Mail Gateway to SMTP 3.0
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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