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diff --git a/manifests/transport_regexp_snippet.pp b/manifests/transport_regexp_snippet.pp
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+++ b/manifests/transport_regexp_snippet.pp
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+/*
+== Definition: postfix::transport_regexp_snippet
+
+Adds a transport_regexp snippets to /etc/postfix/transport_regexp.
+See the postfix::transport_regexp class for details.
+
+Parameters:
+- *source* or *content*: source or content of the transport_regexp snippet
+- *ensure*: present (default) or absent
+
+Requires:
+- Class["postfix"]
+
+Example usage:
+
+  node "toto.example.com" {
+    include postfix
+    postfix::transport_regexp {
+      'wrong_date': content => 'FIXME';
+      'bla':        source => 'puppet:///files/etc/postfix/transport_regexp.d/bla';
+    }
+  }
+
+*/
+
+define postfix::transport_regexp_snippet (
+  $ensure  = "present",
+  $source = '',
+  $content = undef
+) {
+
+  if $source == '' and $content == undef {
+    fail("One of \$source or \$content must be specified for postfix::transport_regexp_snippet ${name}")
+  }
+
+  if $source != '' and $content != undef {
+    fail("Only one of \$source or \$content must specified for postfix::transport_regexp_snippet ${name}")
+  }
+
+  if ($value == false) and ($ensure == "present") {
+    fail("The value parameter must be set when using the postfix::transport_regexp_snippet define with ensure=present.")
+  }
+
+  include postfix::transport_regexp
+
+  $snippetfile = "${postfix::transport_regexp::postfix_transport_regexp_snippets_dir}/${name}"
+  
+  file { "$snippetfile":
+    ensure  => "$ensure",
+    mode    => 600,
+    owner   => root,
+    group   => 0,
+    notify => Exec["concat_${postfix::transport_regexp::postfix_merged_transport_regexp}"],
+  }
+
+  if $source {
+    File["$snippetfile"] {
+      source => $source,
+    }
+  }
+  else {
+    File["$snippetfile"] {
+      content => $content,
+    }
+  }
+
+}