Looking for an open source email gateway

hey, I've been testing scrollout F1 for about 2 weeks now and I like it. also using it inside a KVM (installed with their own ISO) - LXC doesn't work here.

Only seeing two drawbacks to using it:

- no way for users/domains to separately manage their SPAM/HAM it all works via one singel mailbox accessed with IMAP. Which means if you use 1 installation for multiple domains, everyone will see everyone else's HAM/SPAM in the "training folders"

- lack of documentation (or maybe I haven't found it) for the filtering levels. I would need to know what "auto defense" does different on level 4 vs level 5 for example
quick question, how does quarantine and learning from bad messages work?
Does every user get his own login and can mark his emails as SPAM/HAM or does the admin do that globally?

i have it set up that i sends "spam" message as a notification to each user and if they believe the sender is trusted they hit a link that releases the message and treats it as HAM, if not opened it's spam.
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