diff --git a/action/banner.php b/action/banner.php
index abba902..107834d 100644
--- a/action/banner.php
+++ b/action/banner.php
@@ -87,10 +87,8 @@ function showBanner() {
 
         global $INFO;
         if ($this->getConf('apr_mail_receiver') !== '' && $INFO['isadmin']) {
-            $validator                      = new EmailAddressValidator();
-            $validator->allowLocalAddresses = true;
             $addr = $this->getConf('apr_mail_receiver');
-            if(!$validator->check_email_address($addr)) {
+            if(!mail_isvalid($addr)) {
                 msg(sprintf($this->getLang('mail_invalid'),htmlspecialchars($addr)),-1);
             }
 
diff --git a/action/mail.php b/action/mail.php
index b816fba..364d6da 100644
--- a/action/mail.php
+++ b/action/mail.php
@@ -62,10 +62,8 @@ function send_change_mail(&$event, $param) {
 
         // get mail receiver
         $receiver = $this->getConf('apr_mail_receiver');
-        $validator                      = new EmailAddressValidator();
-        $validator->allowLocalAddresses = true;
-        if(!$validator->check_email_address($receiver)) {
-            dbglog(sprintf($this->getLang('mail_invalid'),htmlspecialchars($receiver)));
+        if(!mail_isvalid($receiver)) {
+            dbglog(sprintf($this->getLang('mail_invalid'), htmlspecialchars($receiver)));
             return false;
         }