I’m curious as to what’s going on with Apple Mail on my 2019 MBP (MacOS 10.15.6). Whenever I launch it or switch to it, the processing goes crazy, the temperature quickly rises to about 200º, and the fans come on. When I quit, the temp drops back down to normal, around 115º.
There’s no real indication that Mail is even doing anything:
I composed and sent a very small, 5 line email, and in doing so, I used 4% of the battery!