Umbra Mail
I've seen a dozen "reinvent email" pitches, but wrapping messages in a chat interface is one of the few that actually clicks. The inbox is the last place we still tolerate rigid threading and subject lines, so stripping that away for a conversational flow feels like a natural evolution. It's the same trick Slack and WhatsApp pulled on internal comms, and email has been overdue for that treatment.
The real test is whether it can handle the messy reality of work email, where you need to search, attach, and forward. A chat format works great for quick exchanges, but it can break down when you're dealing with long threads or need to find something from six months ago. I'd want to know how Umbra Mail handles that without turning into a jumbled mess.
Still, I'm rooting for it. If it can nail the balance between calm and functional, it could be the first email client that actually makes me look forward to opening my inbox. That's a big if, but the idea alone is worth paying attention to.