1) There are 2 ways to see logs from rspamd
a) Commandline
From your mailcow-dockerized folder run
docker compose logs rspamd-mailcow
This can be verbose, you can append “| grep REMOTEDOMAIN” to reduce the output
More docs on logs https://docs.mailcow.email/troubleshooting/debug-logs/
b) Rspam UI
On your Web Gui Section go to “System > Configuration” and then “Access > RspamUI”. If you haven’t used RspamUI, you need to set the password before first use on this page. The click the link and provide that password you should get into the RspamUI. The History Tab allows you to browse through recent emails and the filter result can be seen when using the + sign on the left.
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As regards the Mail Provider, almost every mail provider should do that by now. If you have access to another mail account, it most likely does it, unless it’s something exotic, check the headers 😛
I personally use test accounts at GMAIL, MICROSOFT hosted (free hotmail and office365), YAHOO, and some others that are work related. They all do that. Although i favor GMAIL for testing.