diff --git a/Core/API/MailAPI.class.php b/Core/API/MailAPI.class.php
index 055bce9..22be290 100644
--- a/Core/API/MailAPI.class.php
+++ b/Core/API/MailAPI.class.php
@@ -30,7 +30,6 @@ namespace Core\API {
         $password = $settings["mail_password"] ?? "";
         $connectionData = new ConnectionData($host, $port, $login, $password);
         $connectionData->setProperty("from", $settings["mail_from"] ?? "");
-        $connectionData->setProperty("last_sync", $settings["mail_last_sync"] ?? "");
         $connectionData->setProperty("mail_footer", $settings["mail_footer"] ?? "");
         $connectionData->setProperty("mail_async", $settings["mail_async"] ?? false);
         return $connectionData;
diff --git a/Core/API/SettingsAPI.class.php b/Core/API/SettingsAPI.class.php
index ef577c4..9f332aa 100644
--- a/Core/API/SettingsAPI.class.php
+++ b/Core/API/SettingsAPI.class.php
@@ -16,7 +16,6 @@ namespace Core\API {
     public function __construct(Context $context, bool $externalCall = false, array $params = array()) {
       parent::__construct($context, $externalCall, $params);
 
-      // TODO: improve this, additional validation for allowed chars etc.
       // API parameters should be more configurable, e.g. allow regexes, min/max values for numbers, etc.
       $this->predefinedKeys = [
         "allowed_extensions" => new ArrayType("allowed_extensions", Parameter::TYPE_STRING),
@@ -24,7 +23,9 @@ namespace Core\API {
         "user_registration_enabled" => new Parameter("user_registration_enabled", Parameter::TYPE_BOOLEAN),
         "captcha_provider" => new StringType("captcha_provider", -1, true, "none", CaptchaProvider::PROVIDERS),
         "mail_enabled" => new Parameter("mail_enabled", Parameter::TYPE_BOOLEAN),
-        "mail_port" => new IntegerType("mail_port", 1, 65535)
+        "mail_port" => new IntegerType("mail_port", 1, 65535),
+        "rate_limiting_enabled" => new Parameter("rate_limiting_enabled", Parameter::TYPE_BOOLEAN),
+        "redis_port" => new IntegerType("redis_port", 1, 65535),
       ];
     }
   }
diff --git a/Core/Configuration/Settings.class.php b/Core/Configuration/Settings.class.php
index 3fae931..61452f4 100644
--- a/Core/Configuration/Settings.class.php
+++ b/Core/Configuration/Settings.class.php
@@ -181,8 +181,7 @@ class Settings {
       ->addRow("mail_username", '""', false, false)
       ->addRow("mail_password", '""', true, false)
       ->addRow("mail_from", '""', false, false)
-      ->addRow("mail_last_sync", '""', false, false)
-      ->addRow("mail_footer", '""', false, false)
+       ->addRow("mail_footer", '""', false, false)
       ->addRow("mail_async", false, false, false)
       ->addRow("rate_limiting_enabled", json_encode($this->allowedExtensions), false, false)
       ->addRow("redis_host", json_encode($this->redisHost), false, false)
diff --git a/Core/Localization/de_DE/settings.php b/Core/Localization/de_DE/settings.php
index aebb4d9..8a30217 100644
--- a/Core/Localization/de_DE/settings.php
+++ b/Core/Localization/de_DE/settings.php
@@ -45,6 +45,13 @@ return [
   "captcha_site_key" => "Öffentlicher Captcha Schlüssel",
   "captcha_secret_key" => "Geheimer Captcha Schlüssel",
 
+  # redis
+  "rate_limit" => "Rate-Limit",
+  "rate_limiting_enabled" => "Rate-Limiting aktiviert",
+  "redis_host" => "Redis Host",
+  "redis_port" => "Redis Port",
+  "redis_password" => "Redis Passwort",
+
   # dialog
   "fetch_settings_error" => "Fehler beim Holen der Einstellungen",
   "save_settings_success" => "Einstellungen erfolgreich gespeichert",
diff --git a/Core/Localization/en_US/settings.php b/Core/Localization/en_US/settings.php
index 74743d5..e794333 100644
--- a/Core/Localization/en_US/settings.php
+++ b/Core/Localization/en_US/settings.php
@@ -45,6 +45,13 @@ return [
   "captcha_site_key" => "Captcha Site Key",
   "captcha_secret_key" => "Secret Captcha Key",
 
+  # redis
+  "rate_limit" => "Rate Limiting",
+  "rate_limiting_enabled" => "Rate Limiting enabled",
+  "redis_host" => "Redis host",
+  "redis_port" => "Redis port",
+  "redis_password" => "Redis password",
+
   # dialog
   "fetch_settings_error" => "Error fetching settings",
   "save_settings_success" => "Settings saved successfully",
diff --git a/react/admin-panel/src/views/settings/settings.js b/react/admin-panel/src/views/settings/settings.js
index 7a6cbdc..c610995 100644
--- a/react/admin-panel/src/views/settings/settings.js
+++ b/react/admin-panel/src/views/settings/settings.js
@@ -23,11 +23,10 @@ import {
     RestartAlt,
     Save,
     Send,
-    SettingsApplications, SmartToy
+    SettingsApplications, SmartToy, Storage
 } from "@mui/icons-material";
 import TIME_ZONES from "shared/time-zones";
 import ButtonBar from "../../elements/button-bar";
-import {parseBool} from "shared/util";
 import SettingsTextValues from "./input-text-values";
 import SettingsCheckBox from "./input-check-box";
 import SettingsNumberInput from "./input-number";
@@ -67,7 +66,12 @@ export default function SettingsView(props) {
           "captcha_secret_key",
           "captcha_site_key",
       ],
-      "hidden": ["installation_completed", "mail_last_sync"]
+      "redis": [
+          "rate_limiting_enabled",
+          "redis_host",
+          "redis_port",
+          "redis_password"
+      ]
     };
 
     // data
@@ -105,7 +109,6 @@ export default function SettingsView(props) {
                     showDialog(data.msg, L("settings.fetch_settings_error"));
                 } else {
                     setSettings(Object.keys(data.settings)
-                        .filter(key => !KNOWN_SETTING_KEYS.hidden.includes(key))
                         .reduce((obj, key) => {
                             obj[key] = data.settings[key];
                             return obj;
@@ -248,27 +251,27 @@ export default function SettingsView(props) {
         } else if (selectedTab === "mail") {
             return [
                 renderCheckBox("mail_enabled"),
-                renderTextInput("mail_from", !parseBool(settings.mail_enabled)),
-                renderTextInput("mail_host", !parseBool(settings.mail_enabled)),
-                renderNumberInput("mail_port", 1, 65535, !parseBool(settings.mail_enabled)),
-                renderTextInput("mail_username", !parseBool(settings.mail_enabled)),
-                renderPasswordInput("mail_password", !parseBool(settings.mail_enabled)),
-                renderTextInput("mail_footer", !parseBool(settings.mail_enabled)),
-                renderCheckBox("mail_async", !parseBool(settings.mail_enabled)),
+                renderTextInput("mail_from", !settings.mail_enabled),
+                renderTextInput("mail_host", !settings.mail_enabled),
+                renderNumberInput("mail_port", 1, 65535, !settings.mail_enabled),
+                renderTextInput("mail_username", !settings.mail_enabled),
+                renderPasswordInput("mail_password", !settings.mail_enabled),
+                renderTextInput("mail_footer", !settings.mail_enabled),
+                renderCheckBox("mail_async", !settings.mail_enabled),
                 <FormGroup key={"mail-test"}>
                     <FormLabel>{L("settings.send_test_email")}</FormLabel>
-                    <FormControl disabled={!parseBool(settings.mail_enabled)}>
+                    <FormControl disabled={!settings.mail_enabled}>
                         <Grid container spacing={1}>
                             <Grid item xs={1}>
                                 <Button startIcon={isSending ? <CircularProgress size={14} /> : <Send />}
                                         variant={"outlined"} onClick={onSendTestMail}
                                         fullWidth={true}
-                                        disabled={!parseBool(settings.mail_enabled) || isSending || !api.hasPermission("mail/test")}>
+                                        disabled={!settings.mail_enabled || isSending || !api.hasPermission("mail/test")}>
                                     {isSending ? L("general.sending") + "…" : L("general.send")}
                                 </Button>
                             </Grid>
                             <Grid item xs={11}>
-                                <TextField disabled={!parseBool(settings.mail_enabled)}
+                                <TextField disabled={!settings.mail_enabled}
                                            fullWidth={true}
                                            variant={"outlined"} value={testMailAddress}
                                            onChange={e => setTestMailAddress(e.target.value)}
@@ -285,6 +288,13 @@ export default function SettingsView(props) {
                 renderTextInput("captcha_site_key", settings.captcha_provider === "none"),
                 renderPasswordInput("captcha_secret_key", settings.captcha_provider === "none"),
             ];
+        } else if (selectedTab === "redis") {
+            return [
+                renderCheckBox("rate_limiting_enabled"),
+                renderTextInput("redis_host", !settings.rate_limiting_enabled),
+                renderNumberInput("redis_port", 1, 65535, !settings.rate_limiting_enabled),
+                renderPasswordInput("redis_password", !settings.rate_limiting_enabled),
+            ];
         } else if (selectedTab === "uncategorized") {
             return <TableContainer component={Paper}>
                     <Table>
@@ -365,6 +375,8 @@ export default function SettingsView(props) {
                      icon={<Mail />} iconPosition={"start"} />
                 <Tab value={"captcha"} label={L("settings.captcha")}
                      icon={<SmartToy />} iconPosition={"start"} />
+                <Tab value={"redis"} label={L("settings.rate_limit")}
+                     icon={<Storage />} iconPosition={"start"} />
                 <Tab value={"uncategorized"} label={L("settings.uncategorized")}
                      icon={<LibraryBooks />} iconPosition={"start"} />
             </Tabs>