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diff --git a/puppet/modules/postfix/manifests/mta.pp b/puppet/modules/postfix/manifests/mta.pp
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+#
+# == Class: postfix::mta
+#
+# This class configures a minimal MTA, listening on
+# $postfix_smtp_listen (default to localhost) and delivering mail to
+# $postfix_mydestination (default to $fqdn).
+#
+# A valid relay host is required ($postfix_relayhost) for outbound email.
+#
+# transport & virtual maps get configured and can be populated with
+# postfix::transport and postfix::virtual
+#
+# Parameters:
+# - *$postfix_relayhost*
+# - *$postfix_mydestination*
+# - every global variable which works for class "postfix" will work here.
+#
+# Requires:
+# - Class["postfix"]
+#
+# Example usage:
+#
+#   node "toto.example.com" {
+#
+#     class { 'postfix':
+#       smtp_listen => "0.0.0.0",
+#     }
+#
+#     class { 'postfix::mta':
+#       relayhost     => "mail.example.com",
+#       mydestination => "\$myorigin, myapp.example.com",
+#     }
+#
+#     postfix::transport { "myapp.example.com":
+#       ensure => present,
+#       destination => "local:",
+#     }
+#   }
+#
+class postfix::mta(
+  $mydestination = '',
+  $relayhost     = ''
+) {
+
+  #case $relayhost {
+  #  "":   { fail("Required relayhost parameter is not defined.") }
+  #}
+
+  case $mydestination {
+    "": { $postfix_mydestination = "\$myorigin" }
+    default: { $postfix_mydestination = "$mydestination" }
+  }
+
+  postfix::config {
+    "mydestination":                        value => $postfix_mydestination;
+    "mynetworks":                           value => "127.0.0.0/8";
+    "relayhost":                            value => $relayhost;
+    "virtual_alias_maps":                   value => "hash:/etc/postfix/virtual";
+    "transport_maps":                       value => "hash:/etc/postfix/transport";
+  }
+
+  postfix::hash { "/etc/postfix/virtual":
+    ensure => present,
+  }
+
+  postfix::hash { "/etc/postfix/transport":
+    ensure => present,
+  }
+
+}