I just installed mutt and postfix on my server and I've been playing around with it. Now, however, I want to make sure that no one can remotely send mail with my server as a SMTP relay.
I don't know that much about Mail servers, so for the sake of being overly clear, I want to be able to receive messages to local user accounts, send messages from local accounts to outside addresses, but not remotely send messages through the server.
Currently it receives and send's messages just how I want it, but I haven't been able to find a clear way of only disabling remote relaying.
Does anyone have any suggestions? It's a default installation of mutt and postfix, I can post any details you request. Thank you, all!