554 this message has already been here

Brian Lewis test at NEXTMILL.NET
Thu Jun 17 18:19:29 IST 2004

People who send an email to our domain on a mailscanner sometimes get this:
   ----- Transcript of session follows -----
... while talking to mail.nextmill.net.:
>>> DATA
<<< 554 this message has already been here
554 5.0.0 Service unavailable
Reporting-MTA: dns; mailscanner2.nextmill.net
Arrival-Date: Thu, 17 Jun 2004 10:07:20 -0700

Final-Recipient: RFC822; vaughn at dataclues.com
Action: failed
Status: 5.0.0
Remote-MTA: DNS; mail.nextmill.net
Diagnostic-Code: SMTP; 554 this message has already been here
Last-Attempt-Date: Thu, 17 Jun 2004 10:08:27 -0700

Anyone have any idea on what could cause this?  The message is delivered,
but seems to be picked up twice somehow and so the system produces an
error and sends it to the FROM address letting them know the message had
already arrived!

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