Currently, in Plesk, the option to automatically move detected spam emails to the Spam/Junk folder must be configured individually for each mailbox.

I suggest adding a global default setting in Tools & Settings → Spam Filter that enables “Move spam to Spam folder” by default for all existing and new mail accounts – regardless of individual user settings.

Add a checkbox in global spam filter settings: “Enable ‘Move spam to Spam folder’ by default for all mailboxes”

This is a fundamental feature that I believe everyone would welcome, and since it will also be optional, everyone will still be able to decide for themselves what they want to do.