diff --git a/smtp.php b/smtp.php
index bd9d119..2f5fc3c 100644
--- a/smtp.php
+++ b/smtp.php
@@ -89,6 +89,8 @@ class smtp
     * @param string|array $to the recipient of the email. Not displayed in the
     *        email content
     * @param $completeMail The content of the email
+    * @return the message from the server (where is stored the message queue
+    * identifier
     */
   public function send ($from, $to, $completeMail)
   {
@@ -104,7 +106,7 @@ class smtp
     $this->putLine ("DATA\r\n");
     if (substr ($completeMail, -2) !== "\r\n")
       $completeMail .= "\r\n";
-    $this->putLine ("$completeMail.\r\n");
+    return $this->putLine ("$completeMail.\r\n");
   }
 
   /** Disconnect from the SMTP server */