Mutt

Version: 1.5.21 || Release Date: 2010-11-18 || License: Freeware App Owner: enricus

Mutt is a small but very powerful text-based mail client for Unix operating systems.

Features:
-color support
-message threading
-MIME support (including RFC2047 support for encoded -headers)
-PGP/MIME (RFC2015)
-various features to support mailing lists, including list-reply
-active development community
-POP3 support
-IMAP support
-full control of message headers when composing
-support for multiple mailbox formats (mbox, MMDF, MH, maildir)
-highly customizable, including keybindings and macros
-change configuration automatically based on recipients, current folder, etc.
-searches using regular expressions, including an internal pattern matching language
-Delivery Status Notification (DSN) support
-postpone message composition indefinetly for later recall
-easily include attachments when composing, even from the command line
-ability to specify alternate addresses for recognition of mail forwarded from other accounts, with ability to set the From: headers on replies/etc. accordingly
-multiple message tagging
-reply to or forward multiple messages at once
-.mailrc style configuration files
-easy to install (uses GNU autoconf)
-translation into at least 20 languages
-small and efficient
-It's free! (no cost and GPL'ed)

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1 Opinion

To install on OS X you have to use on of this install methods:
- Fink http://pdb.finkproject.org/pdb/package.php/mutt
- MacPorts http://trac.macports.org/browser/trunk/dports/mail/mutt-devel/Portfile
- Homebrew https://github.com/mxcl/homebrew/blob/master/Library/Formula/mutt.rb (this is probably the fastest method).