With the "Subject Notation" function, you can choose what word or identification you wish to use to label the emails classied as unsure or spam.
**Please note, for the hosted domain users this option is unavaliable.**
We generally recommend you to not use the unsure tagging at all. The reason for this is that practically all "unsure" emails are non-spam.
To improve this tagging, you could best report your spam and ham back to the system. You can use the IMAP Training feature located in Spampanel or reachable over IMAP.
More information about the quarantine settings can be found here