Useless because emails arrive with several hours delay, sometimes next day. I already read them on my computer because app is so unreliable on Xiaomi Mi Note 10. When app finally shows new mail I'm tricked into thinking it's the new one while in fact it's old I already read. Really terrible experience because app doesn't have any battery saving optimization which we could turn off to pot. fix this. Updates, reinstall, troubleshooting don't help. 3rd party email apps work fine, ironically.