Airmail: How to not save mail locally? or limit downloading

I have Airmail installed and it downloaded all of my mail and is saving it locally thus taking up space. How can i change this setting. I already went to more and unchecked the server sync but mail is still saved..

Or how can i limit the downloading. Looks like an airmail rep told me the only thing to do is limit downloading

Update: This is what a rep told me to limit downloading

Going through the account settings (Preferences > Select the account > More) you can limit the amount to download based on time, so instead of downloading ALL emails locally it will only do a batch from the past month etc.