Mutt is a text-based IMAP client that is popular on Linux computers, and can be installed on for instance Ubuntu Linux.
To set up Mutt with Runbox, add the following to a file named .muttrc in your home directory:
set imap_user = "username"
set imap_pass = "password"
set smtp_url = "smtp://username@nullmail.runbox.com:587/"
set smtp_pass = "password"
set ssl_starttls = yes
set from = "username@nullrunbox.com"
set realname = "Your Name"
set folder = "imaps://mail.runbox.com:993"
set spoolfile = "+INBOX"
set postponed="+Drafts"
set header_cache=~/.mutt/cache/headers
set message_cachedir=~/.mutt/cache/bodies
set certificate_file=~/.mutt/certificates
set move = no
You can now run Mutt by entering mutt at the command prompt. Then type ? for help, and q to quit.
Note: If you are using your own domain with Runbox, your smtp_url must be entered as follows:
smtp://localpart%25domainyouown.com@mail.runbox.com:587/
Mutt will translate %25 to %, which is the character Runbox uses to separate localparts from domain names.