Open Mail preferences, click on the Junk Mail icon in the toolbar. Click on the Advanced button in the dialog. You can add customized conditions to the list. Alternatively, in Mail preferences click on the Rules icon in the toolbar. Create new rules that would catch something unique in the spam mail you're getting. Perhaps repetitive phrases in the content or something repetitive in the headers.
You could also search www.versiontracker.com and www.macupdate.com for spam catchers and the like that might improve Mail's spam catching capability.
You should also read Mail's help on how to train the built-in spam filter. If you haven't done this then there's more to do to improve Mail's spam filter.
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Why reward points?(Quoted from Discussions Terms of Use.)
The reward system helps to increase community participation. When a community member gives you (or another member) a reward for providing helpful advice or a solution to their question, your accumulated points will increase your status level within the community.
Members may reward you with 5 points if they deem that your reply is helpful and 10 points if you post a solution to their issue. Likewise, when you mark a reply as Helpful or Solved in your own created topic, you will be awarding the respondent with the same point values.