Welcome to mu!
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Given the enormous amounts of e-mail many people gather and the importance of
e-mail message in our work-flows, it's essential to quickly deal with all that
mail - in particular, to instantly find that one important e-mail you need right
now.
mu[1] is a tool for dealing with e-mail messages stored in the Maildir-format. mu's
main purpose is to help you to quickly find the messages you need; in addition,
it allows you to view messages, extract attachments, create new maildirs, โฆ See
the mu cheatsheet[2] for some examples.
Searching works by first indexing your messages into a Xapian-database, which
can then be queried using a custom query language.
Built on top of mu there are some extensions:
* mu-for-emacs (mu4e)[3]: a full-features e-mail client that runs inside emacs
* mu-guile[4]: bindings for the Guile/Scheme programming language
And, there is a toy GTK+-interface called 'mug' (in the 'toys/' subdir)
Mu is written in C and a bit of C++, with mu4e written in Emacs-lisp and
mu-guile in a mix of C and Scheme.
Note, mu is available in Debian/Ubuntu under the name "maildir-utils" because
they don't like short names.
[1] http://www.djcbsoftware.nl/code/mu/
[2] http://www.djcbsoftware.nl/code/mu/cheatsheet.html
[3] http://www.djcbsoftware.nl/code/mu/mu4e.html
[4] http://www.djcbsoftware.nl/code/mu/mu-guile.html