OK, I DID a search and I DID already install and use the user maillog, I just wasn't aware it would receive a copy of all incoming mail, too.
AND, in my case, it would be very convenient to have mail going OUT being sent to one log, and mail coming IN to another. but I guess at this point it isn't possible.
Would it be possibile to make this system add a specific header to either incoming OR outgoing mails, so we could separate them easily? the From: header often gets forged, so what could be the alternatives?
ciao ciao from Italy, Michel