source : http://www.mutt.org/
download : https://www.myqnap.org/product/mutt-cli/
Be sure to have setup notification center before use
Features
Some of Mutt’s features include:
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)
compiled Statically under Alpine Linux for Qnap NAS