title: Postfix - disable open relay
body: <p>I set SASL up on my postfix server and ran an open relay test. The relay access was denied (which is what I want) in all cases except when the sender and recipient are both on my domain. </p>
  
  <p>I'd like to force authentication in all cases except when the sender is localhost. </p>
  
  <p>Did search trying to find out how to do that but couldn't find anything useful. I'd appreciate some help with this, thanks. </p>