diff --git a/htdocs/core/modules/mailings/contacts1.modules.php b/htdocs/core/modules/mailings/contacts1.modules.php
index bc370f5552e..bd4300ea71d 100644
--- a/htdocs/core/modules/mailings/contacts1.modules.php
+++ b/htdocs/core/modules/mailings/contacts1.modules.php
@@ -79,7 +79,7 @@ class mailing_contacts1 extends MailingTargets
 		$statssql[0] .= " count(distinct(c.email)) as nb";
 		$statssql[0] .= " FROM ".MAIN_DB_PREFIX."socpeople as c";
 		$statssql[0] .= " WHERE c.entity IN (".getEntity('socpeople').")";
-		$statssql[0] .= " AND c.email != ''"; // Note that null != '' is false
+		$statssql[0] .= " AND c.email <> ''"; // Note that null != '' is false
 		$statssql[0] .= " AND (SELECT count(*) FROM ".MAIN_DB_PREFIX."mailing_unsubscribe WHERE email = c.email) = 0";
 		$statssql[0] .= " AND c.statut = 1";
 
@@ -103,7 +103,7 @@ class mailing_contacts1 extends MailingTargets
 		$sql .= " FROM ".MAIN_DB_PREFIX."socpeople as c";
     	$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."societe as s ON s.rowid = c.fk_soc";
 		$sql .= " WHERE c.entity IN (".getEntity('socpeople').")";
-		$sql .= " AND c.email != ''"; // Note that null != '' is false
+		$sql .= " AND c.email <> ''"; // Note that null != '' is false
 		$sql .= " AND (SELECT count(*) FROM ".MAIN_DB_PREFIX."mailing_unsubscribe WHERE email = c.email) = 0";
 		// exclude unsubscribed users
 		$sql .= " AND c.statut = 1";
@@ -131,9 +131,9 @@ class mailing_contacts1 extends MailingTargets
 		$sql = "SELECT sp.poste, count(distinct(sp.email)) AS nb";
 		$sql .= " FROM ".MAIN_DB_PREFIX."socpeople as sp";
 		$sql .= " WHERE sp.entity IN (".getEntity('socpeople').")";
-		$sql .= " AND sp.email != ''";    // Note that null != '' is false
+		$sql .= " AND sp.email <> ''";    // Note that null != '' is false
 		$sql .= " AND sp.statut = 1";
-		$sql .= " AND (sp.poste IS NOT NULL AND sp.poste != '')";
+		$sql .= " AND (sp.poste IS NOT NULL AND sp.poste <> '')";
 		$sql .= " GROUP BY sp.poste";
 		$sql .= " ORDER BY sp.poste";
 		$resql = $this->db->query($sql);
@@ -165,7 +165,7 @@ class mailing_contacts1 extends MailingTargets
 		$sql .= " ".MAIN_DB_PREFIX."categorie as c,";
 		$sql .= " ".MAIN_DB_PREFIX."categorie_contact as cs";
 		$sql .= " WHERE sp.entity IN (".getEntity('socpeople').")";
-		$sql .= " AND sp.email != ''";    // Note that null != '' is false
+		$sql .= " AND sp.email <> ''";    // Note that null != '' is false
 		$sql .= " AND sp.statut = 1";
 		$sql .= " AND cs.fk_categorie = c.rowid";
 		$sql .= " AND cs.fk_socpeople = sp.rowid";
@@ -239,7 +239,7 @@ class mailing_contacts1 extends MailingTargets
 		$sql .= " ".MAIN_DB_PREFIX."categorie as c,";
 		$sql .= " ".MAIN_DB_PREFIX."categorie_societe as cs";
 		$sql .= " WHERE sp.entity IN (".getEntity('socpeople').")";
-		$sql .= " AND sp.email != ''";    // Note that null != '' is false
+		$sql .= " AND sp.email <> ''";    // Note that null != '' is false
 		$sql .= " AND sp.statut = 1";
 		$sql .= " AND cs.fk_categorie = c.rowid";
 		$sql .= " AND cs.fk_soc = sp.fk_soc";
@@ -280,7 +280,7 @@ class mailing_contacts1 extends MailingTargets
 		$sql .= " ".MAIN_DB_PREFIX."categorie as c,";
 		$sql .= " ".MAIN_DB_PREFIX."categorie_fournisseur as cs";
 		$sql .= " WHERE sp.entity IN (".getEntity('socpeople').")";
-		$sql .= " AND sp.email != ''";    // Note that null != '' is false
+		$sql .= " AND sp.email <> ''";    // Note that null != '' is false
 		$sql .= " AND sp.statut = 1";
 		$sql .= " AND cs.fk_categorie = c.rowid";
 		$sql .= " AND cs.fk_soc = sp.fk_soc";