There should be a tool on emails suggesting the folders to archive them based on matching words from new email and existing emails, i.e.: There is a topic under discussion on an email chain and you have already created a folder to store these emails. When you receive a new email about this topic, you can read the email still on your Inbox and there is an option on the email itself suggesting to store this email on that folder you have created and already saved other emails on this topic/subject/email-chain.
Idea No. 106