Fairly heavy email user here, but I (personally) wouldn't find use in those metrics. But I like the general idea. I seem to remember that Eudora used to have so

Fairly heavy email user here, but I (personally) wouldn't find use in those metrics. But I like the general idea. I seem to remember that Eudora used to have some analytics. I recently kept an Excel chart of my inbox, so I could see over time how close I was getting to Inbox Zero and how many emails a day I'd need to get through. Combining that with intelligence on how many emails I receive per day on average to calculate an Inbox Zero date estimate could be interesting.