This value is a stub; it will be expanded in the next weeks.
mutt is a command line mailing tool available from the cs shell. mutt allows fast, automated backup for files. mutt is often used in a script which builds, compiles, executes and backups a project with a simple command.
Archive your project:
tar cvf ex3.tar *.c *.h
Send the project tar to an external account for backup:
mutt -s "ex3 files" -a ex3.tar mailto:email@example.com < /dev/null
-s specifies the subject line, -a specifies the attached file, then the destination address and "< /dev/null" sends an empty string as the body text of the message.