Mutt is a small but very powerful text based program for reading electronic mail under unix operating systems, including support color terminals, MIME, and a threaded sorting mode.

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)
• Compiles against either curses/ncurses or S-lang
• Translation into at least 20 languages
• Small and efficient
• It’s free! (no cost and GPL’ed)