Well this is a very old bug, so just to let you know, I installed Geary (sudo apt install geary) and it works fine. It's not exactly the same, but it's very similar and this annoying bug doesn't happen.
Well this is a very old bug, so just to let you know, I installed Geary (sudo apt install geary) and it works fine. It's not exactly the same, but it's very similar and this annoying bug doesn't happen.