We have two Postfix servers. Currently, none of them allow relaying. We accept incoming email only from authenticated users and from mail servers sending mail to any domain where we are the final destination.
We are considering setting up an SMTP smart host server for a few entities that would be allowed to relay through our server. My question is: Is there any security benefits to creating this smart host as a separate SMTP server? Are there any "best practices" for this kind of situation? Thanks!
