I am trying to setup Postfix a few different domains on a virtual host.
I need to have email setup just to send out registration confirmations and new password requests. No one will have a mailbox on this server.
It seems this means that I want to setup Postfix as SMTP only.
I've also read about configuring Postfix null clients for simular needs.
What is the difference between Postfix null client and SMTP only?