Mairix is a program for indexing and searching email messages stored offline on your computer. mairix supports the Maildir, MH folders, and mbox formats.

Some features:

* Indexing is fast. It runs incrementally on new messages - any particular message only gets scanned once in the lifetime of the index file.

* Searching is fast.

* The search mode populates a "virtual" maildir folder with symlinks which point to the real messages. This folder can be opened as usual in your mail program.

* Indexing and searching is based on words. The index file tabulates which words occur in which parts (particular headers + body) of which messages.