Hello,
I've added this to the versions system, and implemented it.
http://www.directadmin.com/features.php?id=1121
I'll be uploading them shortly in the pre-release section.
It's not "all users on one page" type of a listing, but:
1) It will show you on the Admin Stats page how many deliveries have gone out since the last monthly reset.
2) The security.log, system.log and errortaskq.log will have warnings for any User account that has hit their limit. If the limit is unlimited, DA will log the warning at 1000 deliveries.
3) You can also go into each Reseller/User to check which is responsible for the User doing the sending.
Note that the number of deliveries is both in and out, but the limit file is only for outbound emails.. so the warning in #2 won't be totally accurate, hence they're only going to be background logs. I'll do more work later to separate the delivery types so we only check on the correct number. (inbound emails are not limited.. so you might sent 1 email, receive 199, and with a 200 email limit, DA will give you a log warning)
John
