Dumb messages in Outlook

The exchange service I am on for my university email is capped so I regularly run out of space when someone sends me, say, a 5 meg file or something. As such, I constantly try to keep on top of it. One thing that kind of drives me nuts is the triple delete feature in Outlook. It goes like this: I see a message I don't want, I delete it. It goes to the deleted items folder. I right click on the folder and choose to empty the folder. It pops up with a window asking if I want to delete those items, and I need to confirm my choice. Now granted, there is probably a setting to change that, but nevertheless why do I need to go through three steps to delete spam or other unwanted email. Once to delete and once to permanently delete is probably more than enough. I like the way gmail does things wherein you can simply let it clean out your older spam and deleted messages automatically--by default.