system-config/modules/mailman/manifests/init.pp

class mailman($vhost_name=$fqdn) {

  include apache

  package { "mailman":
    ensure => installed,
  }

  apache::vhost { $vhost_name:
    port => 80,
    docroot => "/var/www/",
    priority => '50',
    template => 'mailman/mailman.vhost.erb',
  }
  a2mod { 'rewrite':
    ensure => present
  }

  file { "/var/www/index.html":
    source => 'puppet:///modules/mailman/index.html',
    owner => 'root',
    group => 'root',
    ensure => 'present',
    replace => 'true',
    mode => 444,
    require => Package["apache2"],
  }

  file { '/etc/mailman/mm_cfg.py':
    owner => 'root',
    group => 'root',
    mode => 444,
    ensure => 'present',
    content => template('mailman/mm_cfg.py.erb'),
    replace => 'true',
    require => Package["mailman"]
  }

  service { 'mailman':
    ensure          => running,
    hasrestart      => true,
    hasstatus       => false,
    subscribe       => File['/etc/mailman/mm_cfg.py'],
    require         => Package["mailman"]
  }

  file { '/etc/mailman/en':
    owner => 'root',
    group => 'list',
    mode => 644,
    ensure => 'directory',
    recurse => true,
    require => Package['mailman'],
    source => [
                "puppet:///modules/mailman/html-templates-en",
              ],
  }
}