IIS 6.0 and Virtual SMTP relay ~ some messages are bouncing

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http://serverfault.com – I will give a quick overview and then the details. I have a Exchange 2003 environment that I have been asked to slap on a disclaimer on all outgoing mail. So I have setup a Windows 2003 server and put on the IIS 6.0 and setup the System with the GFI Mail essentials. Initially everything looks good. Though looking at the logs of the GFI I see that there are messages failing to be delivered. There is not a lot of emails being bounced / NDR but I could see that there is also nothing getting back to the users. That is a bad thing since some of the messages are ones that previously could be d (HowTos)