When an email is determined as spam (unsolicited email) by Neo-SpamBlock Service, an information X-SPAM-MARK: by Spam Filter Rule will be added to the email's header information.

If you set to Do not store the Unsolicited Email Folder in Advanced settings, spam email will also be sent to your inbox with this header information. This means, you can sort incoming emails by using this header information.

For how to sort emails in your mailer, refer to the manual or contact the manufacturer of your mailer.