Microsoft KB Archive/99855

= SMTP: Err Msg: 503 Bad Command Sequence =

Article ID: 99855

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Mail Gateway to SMTP 2.1
 * Microsoft Mail Gateway to SMTP 3.0

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This article was previously published under Q99855



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

&quot;503 Bad command sequence&quot;



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 query words: 2.10 3.00 alert errmsg

Keywords: KB99855

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