I am curious as to how the
postfix server installed by default with red hat and is connected to a network that includes a mail server. I had assumed that when I tried to send an email with the
postfix mail server was never set up by me.
However, to my surprise when I sent the email to
email@example.com with the
root@localhost. I am therefore wondering how this email was able to be sent without an email server. How could whichever server managed this know how to correctly deliver the mail with the correct protocols and such to the email address that was given?