Wow folks thanks for the input. 
I will look at Mailarchiva, which looks nice. BUT we have similar functionality right into our CRM so it will probably be redundant.
Now about the scripting. I am not very good at this, but. 
How would I make a custom template for qmail, telling it to drop all COPIES to maillog of outgoing messagges of the user marketing ?   
Or should I say a template for qmail telling to drop messagges to maillog coming from marketing? 
I am not so much confused as at loss..  
ciao from a very hot and sweaty Italy, 
Michel