Gmail As Relay On Ubuntu
sudo apt-get postfix mailutils
Select internet from the pop up and then OK.
postconf -e 'relayhost=gmail-smtp-in.l.google.com' postconf -e 'smtp_sasl_auth_enable=yes' postconf -e 'smtp_sasl_password_maps=hash:/etc/postfix/sasl_passwd' postconf -e 'smtp_sasl_security_options='
echo "gmail-smtp-in.l.google.com sahabcse@gmail.com:XXXXXX" > /etc/postfix/sasl_passwd
chown root:root /etc/postfix/sasl_passwd chmod 600 /etc/postfix/sasl_passwd
postmap /etc/postfix/sasl_passwd
/etc/init.d/postfix restart
echo "This is Content" | sudo mail -s "This is subject" user@home.com
tail -f /var/log/mail.log
REF: [http://ubuntulinux.co.in/blog/ubuntu/set-up-postfix-for-relaying-emails-via-gmail-smtp-server
Set Up Postfix For Relaying Emails via gmail smtp server]