Command-line email client.

# To open the specified mailbox:
mutt -f mailbox

# To send an email and specify a subject and a cc recipient:
mutt -s subject -c

# To send an email with files attached:
mutt -a file1 file2 --

# To specify a file to include as the message body:
mutt -i file

# To specify a draft file containing the header and the body of the message, in RFC 5322 format:
mutt -H file