In this setup I assume that your domain is yourdomain.com and it has a valid MX record call mail.yourdomain.com. Remember to replace yourdomain.com with your actual domain in the example codes in this howto. Also I assume that you know what an MX record is. To find out MX your type in a terminal:
dig mx yourdomain.com
To install postfix
sudo apt-get install postfix
Intall mailx package for use as command mail utility program. Mail command is installed with this package.
sudo apt-get install mailx
wah nech dah akibat pergaulan bebas, jadi sakit demam berdarah dech, kok bisa ya gue di kalahin ama secuil nyamuk.