diff --git a/Gemfile b/Gemfile
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--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,7 @@
+source 'https://rubygems.org'
+
+puppetversion = ENV.key?('PUPPET_VERSION') ? "= #{ENV['PUPPET_VERSION']}" : ['>= 3.3']
+gem 'puppet', puppetversion
+gem 'puppetlabs_spec_helper', '>= 0.1.0'
+gem 'puppet-lint', '>= 0.3.2'
+gem 'facter', '>= 1.7.0'
diff --git a/README.md b/README.md
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+++ b/README.md
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+# postfix
+
+#### Table of Contents
+
+1. [Overview](#overview)
+2. [Module Description - What the module does and why it is useful](#module-description)
+3. [Setup - The basics of getting started with postfix](#setup)
+    * [What postfix affects](#what-postfix-affects)
+    * [Setup requirements](#setup-requirements)
+    * [Beginning with postfix](#beginning-with-postfix)
+4. [Usage - Configuration options and additional functionality](#usage)
+5. [Reference - An under-the-hood peek at what the module is doing and how](#reference)
+5. [Limitations - OS compatibility, etc.](#limitations)
+6. [Development - Guide for contributing to the module](#development)
+
+## Overview
+
+A one-maybe-two sentence summary of what the module does/what problem it solves.
+This is your 30 second elevator pitch for your module. Consider including
+OS/Puppet version it works with.
+
+## Module Description
+
+If applicable, this section should have a brief description of the technology
+the module integrates with and what that integration enables. This section
+should answer the questions: "What does this module *do*?" and "Why would I use
+it?"
+
+If your module has a range of functionality (installation, configuration,
+management, etc.) this is the time to mention it.
+
+## Setup
+
+### What postfix affects
+
+* A list of files, packages, services, or operations that the module will alter,
+  impact, or execute on the system it's installed on.
+* This is a great place to stick any warnings.
+* Can be in list or paragraph form.
+
+### Setup Requirements **OPTIONAL**
+
+If your module requires anything extra before setting up (pluginsync enabled,
+etc.), mention it here.
+
+### Beginning with postfix
+
+The very basic steps needed for a user to get the module up and running.
+
+If your most recent release breaks compatibility or requires particular steps
+for upgrading, you may wish to include an additional section here: Upgrading
+(For an example, see http://forge.puppetlabs.com/puppetlabs/firewall).
+
+## Usage
+
+Put the classes, types, and resources for customizing, configuring, and doing
+the fancy stuff with your module here.
+
+## Reference
+
+Here, list the classes, types, providers, facts, etc contained in your module.
+This section should include all of the under-the-hood workings of your module so
+people know what the module is touching on their system but don't need to mess
+with things. (We are working on automating this section!)
+
+## Limitations
+
+This is where you list OS compatibility, version compatibility, etc.
+
+## Development
+
+Since your module is awesome, other users will want to play with it. Let them
+know what the ground rules for contributing are.
+
+## Release Notes/Contributors/Etc **Optional**
+
+If you aren't using changelog, put your release notes here (though you should
+consider using changelog). You may also add any additional sections you feel are
+necessary or important to include here. Please use the `## ` header.
diff --git a/Rakefile b/Rakefile
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--- /dev/null
+++ b/Rakefile
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+require 'rubygems'
+require 'puppetlabs_spec_helper/rake_tasks'
+require 'puppet-lint/tasks/puppet-lint'
+PuppetLint.configuration.send('disable_80chars')
+PuppetLint.configuration.send('disable_autoloader_layout')
+PuppetLint.configuration.send('disable_variable_scope')
+PuppetLint.configuration.ignore_paths = ["spec/**/*.pp", "pkg/**/*.pp"]
+
+desc "Validate manifests, templates, and ruby files"
+task :validate do
+  Dir['manifests/**/*.pp'].each do |manifest|
+    sh "puppet parser validate --parser=future --noop #{manifest}"
+  end
+  Dir['spec/**/*.rb','lib/**/*.rb'].each do |ruby_file|
+    sh "ruby -c #{ruby_file}" unless ruby_file =~ /spec\/fixtures/
+  end
+  Dir['templates/**/*.erb'].each do |template|
+    sh "erb -P -x -T '-' #{template} | ruby -c"
+  end
+end
diff --git a/manifests/init.pp b/manifests/init.pp
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index 0000000..d4d3f42
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+++ b/manifests/init.pp
@@ -0,0 +1,64 @@
+# == Class: postfix
+#
+# Manage postfix configuration with Debian preseeding
+#
+# === Parameters
+#
+# [*relayhost*]
+#    Set the relayhost for the machine
+#
+# [*main_mailer_type*]
+#    Set the main mailer type as would be asked through debconf.
+#    Values: 'No configuration', 'Internet Site', 'Internet with smarthost', 'Satellite system', 'Local only'
+#    Default: 'Satellite system'
+#
+# [*root_address*]
+#    Set the forward address for mail sent to root.
+#    Default: '' (keeping the current root alias)
+#
+# [*mailname*]
+#    The default domain for outgoing mail
+#    Default: $::fqdn
+#
+# [*destinations*]
+#    Array of domains for whose the mail is locally delivered
+#    Default: [$::fqdn]
+#
+# [*mynetworks*]
+#    Array of networks from which to accept mail
+#    Default: ['127.0.0.0/8', '[::ffff:127.0.0.0]/104', '[::1]/128'] (only accept local mail)
+# === Examples
+#
+#  class { 'postfix':
+#    relayhost => '[smtp.example.com]',
+#  }
+#
+# === Authors
+#
+# Nicolas Dandrimont <nicolas@dandrimont.eu>
+#
+# === Copyright
+#
+# Copyright 2015 Nicolas Dandrimont
+#
+class postfix (
+  $relayhost        = undef,
+  $main_mailer_type = 'Satellite system',
+  $root_address     = '',
+  $mailname         = $::fqdn,
+  $destinations     = [$::fqdn],
+  $mynetworks       = ['127.0.0.0/8', '[::ffff:127.0.0.0]/104', '[::1]/128'],
+){
+
+  validate_string($relayhost)
+  validate_string($main_mailer_type)
+  validate_string($root_address)
+  validate_string($mailname)
+  assert_type(Array[String], $destinations)
+  assert_type(Array[String], $mynetworks)
+
+  ::debconf_package {'postfix':
+    ensure  => present,
+    content => template('postfix/preseed.erb'),
+  }
+}
diff --git a/metadata.json b/metadata.json
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+++ b/metadata.json
@@ -0,0 +1,14 @@
+{
+  "name": "swh-postfix",
+  "version": "0.1.0",
+  "author": "swh",
+  "summary": "Manage postfix installation through Debian preseeding",
+  "license": "Apache 2.0",
+  "source": "git@git.softwareheritage.org:swh/sysadm/puppet/swh-postfix",
+  "project_page": null,
+  "issues_url": null,
+  "dependencies": [
+      {"name":"puppetlabs-stdlib","version_requirement":">= 1.0.0"},
+      {"name":"rlenglet-debconf_package","version_requirement":">= 0.1.1"}
+  ]
+}
diff --git a/spec/classes/init_spec.rb b/spec/classes/init_spec.rb
new file mode 100644
index 0000000..ace8912
--- /dev/null
+++ b/spec/classes/init_spec.rb
@@ -0,0 +1,7 @@
+require 'spec_helper'
+describe 'postfix' do
+
+  context 'with defaults for all parameters' do
+    it { should contain_class('postfix') }
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..2c6f566
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1 @@
+require 'puppetlabs_spec_helper/module_spec_helper'
diff --git a/templates/preseed.erb b/templates/preseed.erb
new file mode 100644
index 0000000..2e72908
--- /dev/null
+++ b/templates/preseed.erb
@@ -0,0 +1,19 @@
+# Template for postfix preseeding
+postfix	postfix/main_mailer_type           select  <%= @main_mailer_type %>
+postfix	postfix/mailbox_limit              string  0
+postfix	postfix/relay_restrictions_warning boolean
+postfix	postfix/tlsmgr_upgrade_warning     boolean
+postfix	postfix/root_address               string  <%= @root_address %>
+postfix	postfix/chattr                     boolean false
+postfix	postfix/relayhost                  string  <%= @relayhost %>
+postfix	postfix/procmail                   boolean false
+postfix	postfix/rfc1035_violation          boolean false
+postfix	postfix/mailname                   string  <%= @mailname %>
+postfix	postfix/protocols                  select  all
+postfix	postfix/destinations               string  <%= @destinations.join(", ") %>
+postfix	postfix/recipient_delim            string  +
+postfix	postfix/sqlite_warning             boolean
+postfix	postfix/retry_upgrade_warning      boolean
+postfix	postfix/mynetworks                 string  <%= @mynetworks.join(" ") %>
+postfix	postfix/kernel_version_warning     boolean
+postfix	postfix/mydomain_warning           boolean
diff --git a/tests/init.pp b/tests/init.pp
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index 0000000..31e2b4b
--- /dev/null
+++ b/tests/init.pp
@@ -0,0 +1,12 @@
+# The baseline for module testing used by Puppet Labs is that each manifest
+# should have a corresponding test manifest that declares that class or defined
+# type.
+#
+# Tests are then run by using puppet apply --noop (to check for compilation
+# errors and view a log of events) or by fully applying the test in a virtual
+# environment (to compare the resulting system state to the desired state).
+#
+# Learn more about module testing here:
+# http://docs.puppetlabs.com/guides/tests_smoke.html
+#
+include postfix