notmuch
Fast, tag-based email indexing and search system
notmuch is a mail indexer that builds a fast full-text search database over a local maildir and uses tags rather than folders to organize mail. Multiple front-ends build on its library.
Key features
- Fast full-text mail search
- Tag-based organization
- Library for many clients
- Works offline on maildir
Strengths
- Released under the GPL-3.0 license
- Written in C
- Tiny footprint — runs in 128 MB RAM
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