In Outlook, select Tools and the Rules & Alerts.....I take it that there's a common theme to your junk, (medications, banks, fake lottery, dear beneficiary letters etc), select common words from the spam that you're receiving - viagra, bank, lottery etc and send these items to the junk email folder. You can then decide whether Outlook deletes them automatically or whether you want to check them first.
I automatically wipe them so that the sender gets no acknowledgement of me having ever received it...which over time also reduces the amount you get.
As an aside just opened my 11 yr olds email to find 86 emails - 80 of them were spam going back over the last 10 days, mostly from African countries looking for her a/c details to give her 8.5 million US dollars......can't wait.....maybe I can put my feet up for a while....assuming she doesn't move out with her new found wealth!! Lol