> Can someone advice on how the best way to detect a circular mail?

Each SMTP server add a "Received:" header line in front of the mail.
You can scan the list of such header lines to see if your server is already 
in the list.

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The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be

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