I guess I'm mainly trying to point out how difficult it is to estimate deliverability. So, rather than pointing to a solution, I'm merely trying to illustrate that the problem exists. There's so many people in this thread claiming that measuring deliverability is "trivial" or getting deliverability is easy ("just do X,Y, and Z"). And when you get down to it, it's mostly people saying "I sent an email to myself and it went through" or saying "nobody ever emailed me back saying they didn't get my email", and so I'm poking holes at those anecdotes. No larger point behind any of this.

Or, if I were to put a larger point behind it, I would say that getting good deliverability is hard and it doesn't make sense to try it unless you are delivering email on behalf of a large amount of people (rather than merely yourself).