Sending, receiving, and organizing email in Outlook.com
I have submitted an enhancement request to allow Rules to run against the Junk email folder. Right now they only run against the Inbox. If they made this enhancement then we could automatically delete the spam instead manually deleting or waiting 30 days for it to get deleted.
Why? Spammers have million/billion other email addresses, IP addresses, subject lines to use. Are you going to keep creating rules? You think you can win a battle between you and spammers using static rules? I'll give you a week or two before you give up adding more rules to auto delete them. Spam filter should have prevented them from getting delivered into any folder (Inbox, Junk or Deleted). This isn't a manual job for users. Trust me, you can't win a fight against spammers using rules.