Apple Mail always shows 2 copies in Sent folder (FIXED)
I'm running Monterey on a Macbook Pro (Intel), and I always see two copies of sent mail when I use Mac Mail. This doesn't happen on my iPhone, only on Mac Mail. One reported solution was to disable something called Antidote, but I don't have that. Plus, I don't have myself cc'd (before the obvious answers come up!). It's annoying, as I have to keep deleting the copies to make my sent folder readable.
Why hasn't this been fixed? What IS the fix? I can't believe that this happens to everyone and is accepted.