only lowercase mail account can be created

bin/v-add-mail-account

@@ -14,7 +14,7 @@ user=$1
 domain=$(idn -t --quiet -u "$2" )
 domain=$(echo $domain | tr '[:upper:]' '[:lower:]')
 domain_idn=$(idn -t --quiet -a "$domain")
-account=$3
+account=$(echo $3 | tr '[:upper:]' '[:lower:]')
 password=$4
 quota=${5-0}
 

web/add/mail/index.php

@@ -147,7 +147,7 @@ if (!empty($_POST['ok_acc'])) {
             $webmail = "http://".$http_host."/webmail/";
             if (!empty($sys['config']['MAIL_URL'])) $webmail = $sys['config']['MAIL_URL'];
 
-            $_SESSION['ok_msg'] = __('MAIL_ACCOUNT_CREATED_OK',$_POST['v_account'],$_POST[v_domain],$_POST['v_account'],$_POST[v_domain]);
+            $_SESSION['ok_msg'] = __('MAIL_ACCOUNT_CREATED_OK',strtolower($_POST['v_account']),$_POST[v_domain],strtolower($_POST['v_account']),$_POST[v_domain]);
             $_SESSION['ok_msg'] .= " / <a href=".$webmail." target='_blank'>" . __('open webmail') . "</a>";
             unset($v_account);
             unset($v_password);