Notmuch is a system for indexing, searching, reading, and tagging large collections of email messages. It uses the Xapian library to provide fast, full-text search of very large collection of email with a very convenient search syntax.
Its more a library than a real search engine, but nevertheless interessting.
Astroid is a Mail User Agent. As such, all Astroid provides is a graphical interface to your email. Thus, Astroid enables you ...
mu is a tool for dealing with e-mail messages stored in the Maildir-format, on Unix-like systems. mu's main purpose is to help ...
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, ...
Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic ...