It's so bizarre to me that this works and I can't say I believed it until I tried. I shouldn't be surprised that it's so easy to trick our brains.

I assume the phenomenon where I write 90% of an email, save it as a draft to finish later, never remember to finish it, get asked about it and have irrefutable certainty I sent it, then finally discover it as an unfinished draft is a facet of the same trickery. Stupid brain... Grrr.

I wrote an email to my titanically incompetent leasing office mostly to vent emotions, then sent it anyway so I could receive proof that they had read it in writing for any future issues. It was quite cathartic.