diff --git a/include/class/sendmail.class.php b/include/class/sendmail.class.php
index 006298fb4..504e7568a 100644
--- a/include/class/sendmail.class.php
+++ b/include/class/sendmail.class.php
@@ -42,10 +42,7 @@ class Sendmail extends  Sendmail_Core
     {
         if ( $this->can_send() == false )            throw new Exception(_('Email non envoyé'),EMAIL_LIMIT);
 
-        if (!mail($this->mailto, $this->subject, $this->content,$this->header))
-        {
-            throw new Exception('send failed');
-        }
+        parent::send();
         // Increment email amount
         $repo =new Database();
         $date=date('Ymd');
@@ -167,7 +164,7 @@ class Sendmail extends  Sendmail_Core
                 array(1,$p_dossier,$p_date));
             return;
         } else {
-            // update + sp_emaoun_email
+            // update + amount of sent emails 
             $p_repo->exec_sql("update dossier_sent_email set de_sent_email=de_sent_email+1 where dos_id=$1 and de_date=$2",
                 array($p_dossier,$p_date));
         }
diff --git a/include/config.inc.example b/include/config.inc.example
index bb59e7255..d0deec652 100644
--- a/include/config.inc.example
+++ b/include/config.inc.example
@@ -97,4 +97,7 @@ define ("DEBUGNOALYSS",0);
 // change NOALYSS_URL with your URL , 
 // with NGINX it is needed to set the NOALYSS_URL , it is the default URL of 
 // your installation, example with https://demo.noalyss.eu
-// define ("NOALYSS_URL","https://demo.noalyss.eu");
\ No newline at end of file
+// define ("NOALYSS_URL","https://demo.noalyss.eu");
+// For POSTFIX, when sending email from NOALYSS via sendmail an extra parameter is needed
+// for the Return-Path, the FROM will be replaced by the Sendmail_Core->from value
+//define("MAIL_EXTRA_PARAM","-f [FROM]")
diff --git a/include/constant.php b/include/constant.php
index f04ac9de6..00cf4ddc5 100644
--- a/include/constant.php
+++ b/include/constant.php
@@ -452,7 +452,9 @@ function noalyss_class_autoloader($class)
     }
 
 }
-
+if ( ! defined("MAIL_EXTRA_PARAM")) {
+    define("MAIL_EXTRA_PARAM","-f [FROM]");
+}
 spl_autoload_register('\noalyss_class_autoloader', true);
 
 require_once NOALYSS_BASE.'/vendor/autoload.php';
diff --git a/include/lib/config_file.php b/include/lib/config_file.php
index dbc7bec13..1411ba687 100644
--- a/include/lib/config_file.php
+++ b/include/lib/config_file.php
@@ -306,6 +306,13 @@ function display_file_config($p_array, $from_setup = 1, $p_os = 1)
 // your installation, example with https://demo.noalyss.eu $a
 // define ("NOALYSS_URL","https://demo.noalyss.eu"); $a
 EOF;
+    echo <<<EOF
+// $a 
+// $a
+// For POSTFIX, when sending email from NOALYSS via sendmail an extra parameter is needed $a
+// for the Return-Path, the [FROM] will be replaced by the email of the sender (Sendmail_Core->from value)$a
+//define("MAIL_EXTRA_PARAM","-f [FROM]") $a
+EOF;    
 }
 /*!
  * \brief create the config file
diff --git a/include/lib/sendmail_core.class.php b/include/lib/sendmail_core.class.php
index 74c6a0b03..2768119de 100644
--- a/include/lib/sendmail_core.class.php
+++ b/include/lib/sendmail_core.class.php
@@ -46,11 +46,39 @@ class Sendmail_Core
     protected $content;
     protected $header;
     protected $format;
+    
+    protected $supplemental_header; //!< $supplemental_header(string) supplemental header to add
+    protected $supplemental_param; //!< $supplemental_param (string)  5th parameter for mail() 
+                            // for postfix, it should be "-f {$this->from}" for the Return-Path
+                                   
     function __construct()
     {
         $this->format='PLAIN';
+        $this->supplemental_header="";
+        $this->supplemental_param=MAIL_EXTRA_PARAM;
     }
-    
+    public function getSupplemental_param()
+    {
+        return $this->supplemental_param;
+    }
+
+    public function setSupplemental_param($supplemental_param)
+    {
+        $this->supplemental_param = $supplemental_param;
+        return $this;
+    }
+
+    public function getSupplemental_header()
+    {
+        return $this->supplemental_header;
+    }
+
+    public function setSupplemental_header($supplemental_header)
+    {
+        $this->supplemental_header = $supplemental_header;
+        return $this;
+    }
+
     public function get_format() {
         return $this->format;
     }
@@ -137,7 +165,7 @@ class Sendmail_Core
      */
     function add_supplemental_header()
     {
-        return '';
+        return $this->supplemental_header;
     }
     /**
     *@brief  create the message before sending
@@ -156,6 +184,7 @@ class Sendmail_Core
 
         // main header (multipart mandatory)
         $this->header = "From: " . $this->from . $eol;
+        $this->header .= "Reply-To: " . $this->from . $eol;
         $this->header .= "MIME-Version: 1.0" . $eol;
         $this->header .= $this->add_supplemental_header();
         if ($this->format == 'PLAIN')
@@ -232,6 +261,7 @@ eof;
         if ( empty ($this->afile) ) $this->content.=$eol;
 
         $this->content .= "--" . $separator . "--";
+        $this->supplemental_param= str_replace("[FROM]", $this->from, $this->supplemental_param);
     }
 
     /**
@@ -246,8 +276,9 @@ eof;
         } catch (Exception $e) {
             throw $e;
         }
-
-        if (!mail($this->mailto, $this->subject, $this->content,$this->header))
+        $encoded_subject = mb_encode_mimeheader( $this->subject, 'UTF-8', 'B');
+        
+        if (!mail($this->mailto,$encoded_subject, $this->content,$this->header,$this->supplemental_param))
         {
             throw new Exception('send failed');
         }