Increase your settings. The more aggressive the filter setting, the fewer spam messages will reach your inbox. Please note that more aggressive the setting, the more often you should visit the Message Center to confirm that legitimate messages are not quarantined. If they are, add those senders or domains to your Approved Sender list.
Review your Approved Mailing List. Do you have other email addresses forwarding to this account? Check to be sure your addresses are NOT on the Approved Mailing List
Forward your spam. Participate in keeping the filters accurate by sending your unfiltered spam
messages AS ATTACHMENTS in email to firstname.lastname@example.org. This does not guarantee that these messages will be filtered in the future, but will make it more likely.