SMTP: Err Msg: 503 Bad Command Sequence

 Last reviewed: October 20, 1997
Article ID: Q99855
2.10 3.00 MS-DOS kb3rdparty

The information in this article applies to:

  • Microsoft Mail Gateway to SMTP, versions 2.1 and 3.0

SYMPTOMS

Versions 2.1 and 3.0 of Microsoft Mail Gateway to SMTP may display this error message: 

   "503 Bad command sequence"

CAUSE

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.

RESOLUTION

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.

Additional reference words: 2.10 3.00 alert errmsg
KBCategory: kb3rdparty
KBSubcategory: MailGWSMTP

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Last reviewed: October 20, 1997
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