Postfix S/MIME forwarder

Ansible Role to configure Postfix as mail forwarder using S/MIME encryption.

Inspirited by:

• https://github.com/Oefenweb/ansible-postfix
• https://github.com/infertux/zeyple
• https://github.com/hajzer/bash-postfix-encrypt-filter
• https://github.com/svenbs/mailenc
• https://www.softed.de/blog/smime-verschlusselung-durch-postfix-filter/