Ah ok. You can adjust the spam filter in the UI of each induvidual account:
All emails that have a higher score than the right slider will be rejected, and all emails with a score that lies between the two sliders will go to the spam folder.
So you can just move the right slider further to the right, to move more mails directly to spam folder, or you can move it all the way to the right. Then every email that has a higher score than the left slider goes directly to the spam folder and no emails are going to be rejected.
You can also set this globally for all accounts: