Mutt is a sophisticated text-based Mail User Agent. Some highlights:
* MIME support (including RFC1522 encoding/decoding of 8-bit message headers and UTF-8 support). * PGP/MIME support (RFC 2015). * Advanced IMAP client supporting SSL encryption and SASL authentication. * POP3 support. * ESMTP support. * Message threading (both strict and non-strict). * Keybindings are configurable, default keybindings are much like ELM; Mush and PINE-like ones are provided as examples. * Handles MMDF, MH and Maildir in addition to regular mbox format. * Messages may be (indefinitely) postponed. * Colour support. * Highly configurable through easy but powerful rc file. * Support for compressed mailboxes. * An optional Sidebar.