title: how to configure a vps server to send emails on linux
body: <p>I am planning to rent a vps outside my primary site</p>
  
  <p>I want to configure this vps to send emails only not receive.</p>
  
  <p>say at my primary site I have an smtp server smtp.xyz.com</p>
  
  <p>I don't want to use this smtp server for the new vps</p>
  
  <p>how can I configure sendmail/postfix to send emails from this vps?</p>