I suspect this can't be done, but....

Management noticed that one of our customer's mail systems adds warning to all messages received from the internet that says something like

"WARNING: This message was received from the internet. Be careful when clicking links or opening attachments; be sure you know who it's from and what the link or attachment contains".

Now they think it's a good idea if our system does that. (nevermind discussion on the merits of this idea)

Is there any way to do this? I'm pretty sure GroupWise can't do it on it's own, but does anyone know a way it can be done?