http://askubuntu.com/questions/12917/how-to-send-mail-from-the-command-line

ssmtp 설치/설정

• Install ssmtp : sudo apt-get install ssmtp

• Edit the ssmtp config file : gksu gedit /etc/ssmtp/ssmtp.conf

• Enter this in the file: 
  root=username@gmail.com 
  mailhub=smtp.gmail.com:465 
  rewriteDomain=gmail.com 
  AuthUser=username 
  AuthPass=password 
  FromLineOverride=YES 
  UseTLS=YES

• Enter the email address of the person who will receive your email:

  ssmtp recepient_name@gmail.com

• Now enter this: 
  To: recipient_name@gmail.com 
  From: username@gmail.com 
  Subject: Sent from a terminal!

  
  Your content goes here. Lorem ipsum dolor sit amet, consectetur adipisicing.

• To send the email: Ctrl + D

  
  

첨부파일 포함 메일 보내기

mail name@mailserver.com -s "Attached file" <<EOF                 
Hi

~| uuencode $HOME/filename.txt filename.txt

EOF