Trojit?? Email Client is an Open Source email app that is loyal to open standards and modern technologies and because it uses IMAP, you can view and manipulate your messages as if they are stored locally on your devices while they are actually stored on a mail server.
Don’t be excited yet, though. Trojit?? is not the typical email client as it does not support the POP3 protocol, nor does it contain calendar, alarm, and reminder features. All these, it seems to have traded off for its speed.