@murgero No, I came from hardware/mailserver docker containers, which is located here for reference: https://github.com/hardware/mailserver
It was one of the best mail server suites I had hosted. I moved to Cloudron for saving money as I no longer wanted to have a dedicated mail server when I had to have one for Cloudron too, and while it's been a good experience overall I can't seem to get the spam filtering to work at all off my marked spam messages from the spam folder. It seems to block some at the SMTP level when it receives a message that's on the blacklist, however it seems like it's completely not capable of learning anything from my spam folder. Most messages are very similar in subject, content, format, etc. There are 193 messages in my Spam folder right now since just July 12th, so just over half a month. Almost every single one of those originally ended up in my inbox, several a day, that I have to manually move over to the Spam folder in hopes of it learning it.
It's always possible something is wrong in my install maybe, and I'm happy to troubleshoot that, but in my personal experience SpamAssassin really isn't as effective as Rspamd from the different mail servers I've hosted over the years. Once I moved to Rspamd, it was as if it caught 98% of my spam and they showed up in the Spam folder as desired. Right now I'd say maybe 5% show up in my spam folder under the Cloudron mail server.