Similar concept and similar speed, but notmuch is a little more actively developed. I also find the notmuch command line interface a bit easier and the various

Similar concept and similar speed, but notmuch is a little more actively developed. I also find the notmuch command line interface a bit easier and the various tools built on top of it to be better. Alot, the terminal UI I mentioned in the parent comment, is almost exactly what I want in a mail program.