This is cool, thank you for posting. I gave it a try but... I don't think it's really there. I think the thing that Hey figured out is that the best way to sort mail is by sender. Due to DKIM, SPF, et all, it's the only part of an email that can't be spoofed. So they've made a system totally built on that, with single clicks to move senders to different buckets.<p>Yes, you can do that in Fastly, but it's a cludge. You have to maintain contact groups, which means that every new sort "rule" involves a contact add plus a visit to the contacts page to put them in the right group. There's nothing stopping Fastly from making this dead simple, but it's not dead simple right now.<p>And on top of that, there are benefits to building a UI around Hey's rigid bucket structure. The "feed" area, for example, shows the first few hundred pixels of every email just like it's a feed reader. You get the cool "focus and reply" screen for emails you've put off.<p>I think, if you really like Hey, use Hey, don't try to recreate it somewhere else. If you're on Fastly, you probably already have a really good system that works great for you, so stick with that.