Looks good !
I think that basically we need the same features as those provided with the current user interface. I was thinking that probably users and email management could be merged.
As a bonus, A small graph representing the hourly / weekly / monthly volume of mails / spam / rejected would be more useful than that sector graph.
I’d like to have a live view of the maillog too.
A top 10 users report (on different time spans) would be nice.
An integration of the rspamd web interface would be great !
The way the aliases targets are displayed (and searched) is not perfect right now (in the server manager) especially when there are a lot of targets that cannot all be displayed : in that case it is not possible to search for each occurence of an email target. See below what I’m talking about :

That’s what I can see right now. Please keep us updated !