sup

https://github.com/sup-heliotrope/sup

Sup is a console-based email client for people with a lot of email. * GMail-like thread-centered archiving, tagging and muting * Handling mail from multiple mbox and Maildir sources * Blazing fast full-text search with a rich query language * Multiple accounts - pick the right one when sending mail * Ruby-programmable hooks * Automatically tracking recent contacts