I was struggling with the same issue. Aqua Mail is a great app, has everything I need, but the only thing missing are folder-specific notifications. I personally sort/group mails originated from different senders to appropriate folders/labels and for some of them I would like to have specific notification. There is one way around, namely Tasker. Thanks to Aqua Mail integration with Tasker I was able to create an Event profile which triggers once the email from specific sender is received. In my case it corresponds to specific folder/label and then it triggers an action to play a notification sound or you can even create your own status bar notification with Notify action. You just need to select 'Do not notify' option for that specific folder/label to avoid getting double notifications. Works really good! Anyway it would be really good to get such functionality directly in the app.
