Quite some time ago now, I tried sup but found it's indexing latencies unacceptable for my workflow. I also found the user interface a bit foreign and hard to get into.

More recently I've found notmuch, a project that started as a C rewrite of the core bits of sup. Basically, it's a program that indexes and searches through your existing mail.

I had two issues with it.

  • it had an emacs interface, and
  • it uses maildir instead of mailbox.

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