When I was a customer at Cistron they had some simple stats to give their customers an idea of the total bandwidth used. Now that they've been taken over by xs4all these statistics have gone. But the program they used is quite simple. I've now set up my own page which shows the use of some network links on my main server. I know there are a lot of newer and better programs than MRTG but I like the simple and clean design which suits my needs just fine. If only there were some snmp support in exim.