@thunderbird I personally wouldn't mind something like ChatGPT in Thunderbird or even in #ObsidianMD - being able to ask a more natural question of my own data, such as, "What is this email thread about?" or, "Can you give me a summary of last month?" I feel would be incredibly useful.
However, my main contention would be that a solution like this would have to be:
- On-device, no cloud processing
- Transparent, explains where it got that information from