Yeah it is very confusing from a client perspective. The gnome mail clients use:
[image: 1753106199133-3deca580-e20c-4142-bb75-1df2d6c6fa65-image-resized.png]
Thunderbird also does so
[image: 1753106233013-d3a37fd4-2ae9-449a-b87e-c03c56faaac5-image.png]
Same K9 and the random email app I have on my Android phone.
Can't say much about how the situation on mac or windows is though, as I don't have such environments.
