Original instructions to modify mailgraph in this thread still apply in NS 7. Honestly, I don’t know how to adapt upstart config to systemd, let’s try to involve @davidep.
I asked him if we could revert to standard postfix logging in NS 7, but we may overcount emails.
Either way, we will have to modify something.
As I promised, I tried also Awstats on NS 7 alpha 2.
Now I can reach the page but I have no registrations (in /var/log/maillog there are registrations; I have emails on this account, s & r) and at Last Update it’s written Never updated.
I have recently switched from Mailserv (on OPenBSD). It uses dovecot, roundcube and a few tools in common. You could look at its dashboard and statistics page as well. I am including four screenshots. The first is the dashboard, the next two the first part of the statistics page and the last the bottom of the statistics page.
Over all I found them useful, although I was unable to select prior months details off the Web UI.