Better integration with Spamsieve
Spamsieve detects spam just fine in Airmail, but the problem is that Airmail doesn't immediately move the spam to the spam folder. Instead, you have to wait until Airmail's Inbox refreshes (takes at least 1 minute if you set it that way). It's annoying to see so much spam just sitting in your Inbox every time you look at it. Airmail should immediately move the spam to the spam folder.