diff --git a/htdocs/lib/CMailFile.class.php3 b/htdocs/lib/CMailFile.class.php3
index 2d3d1696559..0ec7c1c0a05 100644
--- a/htdocs/lib/CMailFile.class.php3
+++ b/htdocs/lib/CMailFile.class.php3
@@ -102,7 +102,7 @@ class CMailFile
     {
       $out = "From: $addr_from\n";
       $out = $out . "Reply-To: $addr_from\n";
-      $out = $out . "X-Mailer: Dolibarr\n";
+      $out = $out . "X-Mailer: Dolibarr version " . DOL_VERSION ."\n";
       $out = $out . "X-Sender: $addr_from\n";
       return $out;
     }