i18n

resource/locales/en_US/admin/admin.json

@@ -28,6 +28,7 @@
     "update": "Update",
     "mail_settings": "E-mail Settings",
     "from_e-mail_address": "From e-mail address",
+    "transmission_method":"Transmission Method",
     "smtp_settings": "SMTP settings",
     "host": "Host",
     "port": "Port",

resource/locales/ja_JP/admin/admin.json

@@ -28,6 +28,7 @@
     "update": "更新",
     "mail_settings": "メールの設定",
     "from_e-mail_address": "Fromアドレス",
+    "transmission_method":"送信方法",
     "smtp_settings": "SMTP設定",
     "host": "ホスト",
     "port": "ポート",

resource/locales/zh_CN/admin/admin.json

@@ -27,7 +27,8 @@
 		"attach_enable": "如果启用此选项，则可以附加图像文件以外的文件。",
 		"update": "更新",
 		"mail_settings": "邮件设置",
-		"from_e-mail_address": "From e-mail address",
+    "from_e-mail_address": "From e-mail address",
+    "transmission_method":"Transmission Method",
 		"smtp_settings": "SMTP 设置",
 		"host": "服务器",
 		"port": "端口号",

src/client/js/components/Admin/App/MailSetting.jsx

@@ -102,8 +102,7 @@ class MailSetting extends React.Component {
           <label
             className="text-left text-md-right col-md-3 col-form-label"
           >
-            {/* TODO */}
-            送信方法
+            {t('admin:app_setting.transmission_method')}
           </label>
           <div className="col-md-6">
             {transmissionMethodsSettings}