diff --git a/htdocs/public/emailing/mailing-read.php b/htdocs/public/emailing/mailing-read.php
index 1e991305658..4aa388ecf24 100644
--- a/htdocs/public/emailing/mailing-read.php
+++ b/htdocs/public/emailing/mailing-read.php
@@ -72,13 +72,13 @@ if (! empty($tag))
 	$resql=$db->query($sql);
 
 	//Update status communication of thirdparty prospect
-	$sql = "UPDATE ".MAIN_DB_PREFIX."societe SET fk_stcomm=3 WHERE rowid IN (SELECT source_id FROM ".MAIN_DB_PREFIX."mailing_cibles WHERE tag='".$db->escape($tag)."' AND source_type='thirdparty' AND source_id is not null)";
+	$sql = "UPDATE ".MAIN_DB_PREFIX."societe SET fk_stcomm=3 WHERE fk_stcomm != -1 AND rowid IN (SELECT source_id FROM ".MAIN_DB_PREFIX."mailing_cibles WHERE tag='".$db->escape($tag)."' AND source_type='thirdparty' AND source_id is not null)";
 	dol_syslog("public/emailing/mailing-read.php : Mail read thirdparty : ".$sql, LOG_DEBUG);
 
 	$resql=$db->query($sql);
 
     //Update status communication of contact prospect
-	$sql = "UPDATE ".MAIN_DB_PREFIX."societe SET fk_stcomm=3 WHERE rowid IN (SELECT sc.fk_soc FROM ".MAIN_DB_PREFIX."socpeople AS sc INNER JOIN ".MAIN_DB_PREFIX."mailing_cibles AS mc ON mc.tag = '".$db->escape($tag)."' AND mc.source_type = 'contact' AND mc.source_id = sc.rowid)";
+	$sql = "UPDATE ".MAIN_DB_PREFIX."societe SET fk_stcomm=3 WHERE fk_stcomm != -1 AND rowid IN (SELECT sc.fk_soc FROM ".MAIN_DB_PREFIX."socpeople AS sc INNER JOIN ".MAIN_DB_PREFIX."mailing_cibles AS mc ON mc.tag = '".$db->escape($tag)."' AND mc.source_type = 'contact' AND mc.source_id = sc.rowid)";
 	dol_syslog("public/emailing/mailing-read.php : Mail read contact : ".$sql, LOG_DEBUG);
 
 	$resql=$db->query($sql);