Mutt is an email client
Debian:
# apt-get install mutt
Freebsd:
# pkg install mail/mutt-lite
? Help
j Next message
k Previous message
Enter Read message
d Delete message
u Un-delete message
z Next page (or PgDn)
Z Previous page (or PgUp)
> Next line
< Previous line
m Compose new message
r Reply
f Forward message
g Reply to all
G Get any new mail
N Toggle "new" status of message
q Quit