i just have seen your video
awesome work dude, keep it up

Few suggestions:
some sort of "adding accounts" assistent"
ability to add an "email patterns" e.g. i send you a pattern for a email config an it appears in the patterns of the adding client
option: if you open the client it sends/recieve the emails

maybe an option for replacing the standard email client so it opens when you click an email link

Maybe you can integrate it on the CSSU
i would love to test the client as soon it is ready

Best Regards Unit247

PS: sorry for my bad english