Puppet configuration for SMTP smarthost with postfix

common.yaml

profile::smarthost::postfix_config:
  mynetworks: >-
    127.0.0.0/8
    [::1]/128
    192.0.2.0/24
    [2001:db8::]/32

Puppetfile

mod 'postfix',
  :git => 'https://github.com/camptocamp/puppet-postfix.git',
  :ref => '1.2.14'

smarthost.pp

class profile::smarthost {
  include ::postfix
  $postfix_config = hiera('profile::smarthost::postfix_config', {})
  create_resources('postfix::config', $postfix_config, { ensure => present })
}