ASSUME that your username on your computer is 'username' 
and your email address is you@isp.com.au,
then edit these lines below for that data and shove them into $HOME/.muttrc


    # local configuration file for Mutt
    # for handling mime types see ~/.mailcap
    set editor=vi        [ or    set editor=nano    if you do not use 'vi']
    set folder=~/Mail
    set copy=yes
    set postponed="~/Mail/postponed"
    set spoolfile=/var/spool/mail/username
    set mbox=~/mbox
    my_hdr From: "You" <you@isp.com.au>
    set sort=threads
    set edit_headers
    set record="=sentmail"   
    unset write_bcc
    unset bounce_delivered