First steps towards performing SMTP authentication using dovecot SASL.
Fixing typo.
Fixing comment.
Dovecot portion of configuration needed for Dovecot SASL authentication with postfix.
Fixing access to the userdb socket to fix doveadm and more.
Stop automatically relaying email from the public IP address: if another computer is trying to send an email through the server from the LAN behind the NAT, it should use SMTP authentication; other than external authenticated SMTP connections, we only relay mail from localhost.