You need to identify where the duplication is taking place.
Is it occurring before or after delivery to your server.
Is it just external email, or are internal messages affected as well.
The most common cause is interference in the SMTP traffic flow from AV/Antispam/Firewall. The message is not reported as being delivered correctly, and the sending server sends it again.
Simon.
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by: mattee76Posted on 2007-06-13 at 10:45:56ID: 19276487
Do you have filelevel AV on exchange?