Just a heads up.
If Mailacton is installed Spamsieve does not work well.
It even does not check the messages as they arrive.
I have disabled Mailacton and everything works fine.
Also Mailacton disables the rule in mail.
Hope this helps.
Michael thanks for tou fantastic support.
Which version of Mail Act-On are you using? By “disables the rule” do you mean that the SpamSieve rule in Mail is unchecked? In any case, please report this to SmallCubed.