That sounds really interesting, and I've often wanted to do something similar myself. Do you have plans for a convenient curses-based interface, so I don't have to type stuff out or press enter all the time?

I suspect one of us is misunderstanding the project, and I'm unsure which it is.

There is already a curses interface, as per the (outdated) screenshots page:

http://lumail.org/screenshots/

Really lumail is a console application, similar to mutt, but with a different feature-set. (i.e. No IMAP, no POP3, real scripting, modal-mode, and similar.)