[0815test]

Thunderbird runs on XULRunner - strictly speaking it's not Electron, but the overall architecture is very similar, with highly comparable drawbacks.

[lasagnaphil]

Yep, I've noticed the performance wasn't that great. It seems like there isn't a native email app in 2019 that supports HTML... Maybe is it because displaying HTML itself is pretty hard without a runtime like Electron or XULRunner?