I noticed that, as regards the Antispam settings, domain administrators can only modify:

- filtering actions on spam detection LOW, MEDIUM and HIGH

- Trusted Senders

In the past it seemed to me that the other settings could also be changed (I don't remember if all or only partially ...)

It would be possible to enable domain administrators (and perhaps even individual users) to be able to customize advanced antispam settings (Spam Checks, RBLs, GreyListing, SMTP blocking, etc.) for the single domain (and possibly the individual user) ?