Adapt Postfix config and add Dovecot

dovecot.yml

host_vars/gabriel.c3heaven.de

inventory

roles/dovecot-pop3d/meta/main.yml

roles/dovecot-pop3d/tasks/main.yml

roles/dovecot/defaults/main.yml

roles/dovecot/handlers/main.yml

roles/dovecot/meta/main.yml

roles/dovecot/tasks/main.yml

roles/dovecot/templates/10-ssl.conf.j2

roles/postfix/defaults/main.yml

roles/postfix/templates/main.cf.j2