install mutt on ubuntu 16.04

sudo apt install mutt

mkdir -p ~/.mutt/cache/headers
mkdir ~/.mutt/cache/bodies
touch ~/.mutt/certificates

touch ~/.mutt/muttrc

vim ~/.mutt/muttrc

set ssl_starttls=yes
set ssl_force_tls=yes

set imap_user = 'change_this_user_name@gmail.com'
set imap_pass = 'PASSWORD'

set from='change_this_user_name@gmail.com'
set realname='Your Name'

set folder = imaps://imap.gmail.com/
set spoolfile = imaps://imap.gmail.com/INBOX
set postponed="imaps://imap.gmail.com/[Gmail]/Drafts"

set header_cache = "~/.mutt/cache/headers"
set message_cachedir = "~/.mutt/cache/bodies"
set certificate_file = "~/.mutt/certificates"

set smtp_url = 'smtps://change_this_user_name@gmail.com:PASSWORD@smtp.gmail.com:465/'

set move = no
set imap_keepalive = 900

https://security.google.com/settings/security/apppasswords

Generate application password, and replace PASSWORD with this password.

$ mutt

References