====== Postfix ======

Diffie-Hellmann Parameter erstellen

  openssl dhparam -out /etc/postfix/dh_512.pem -2 512
  openssl dhparam -out /etc/postfix/dh_2048.pem -2 2048
  
  chmod 400 /etc/postfix/dh_512.pem
  chmod 400 /etc/postfix/dh_2048.pem

Server, der keine eigene Mail zustellt:
<file conf main.cf>
relayhost = mailserver.example.com
</file>

Computer nur zum Mailversand
<code>
mydestination = $myhostname, localhost.rowa.int, localhost
relayhost = ...
inet_interfaces = loopback-only
inet_protocols = ipv4
</code>