postfix: smtp mail transfer agent
postfix: 
postfix: Postfix is a secure, flexible and powerful SMTP mail transfer agent
postfix: Postfix attempts to be fast,easy to administer, while at the same
postfix: time being sendmail compatible enough to not upset your users.
postfix:
postfix: Postgrey is a Postfix policy server implementing greylisting
postfix:
postfix:
postfix: 
postfix: