diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index f8820be..b53dab8 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -15,7 +15,10 @@ function App() {
   const [allRules, setAllRules] = useState([]);
   const [showAllRules, setShowAllRules] = useState(false);
   const [toast, setToast] = useState(null);
-  const [isAuthenticating, setIsAuthenticating] = useState(false);
+  const [isAuthenticating, setIsAuthenticating] = useState(() => {
+    const params = new URLSearchParams(window.location.search);
+    return !!(params.get('email') && params.get('expires') && params.get('signature'));
+  });
   const [singleEmailMode, setSingleEmailMode] = useState(false);
 
   const showToast = (message, type = 'success') => {
@@ -184,106 +187,34 @@ function App() {
       <Header />
 
       <main className="max-w-5xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
-        {/* Single Email Mode Header */}
-        {singleEmailMode && email && (
-          <div className="card mb-8 bg-gradient-to-r from-primary-50 to-primary-100 border-primary-200">
-            <div className="flex items-center gap-4">
-              <div className="bg-primary-600 text-white rounded-full w-12 h-12 flex items-center justify-center">
-                <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z" />
-                </svg>
-              </div>
-              <div className="flex-1">
-                <h2 className="text-xl font-bold text-gray-900">Your Email Configuration</h2>
-                <p className="text-sm text-primary-700 font-medium mt-1">{email}</p>
-              </div>
-            </div>
+        {/* Authenticating State */}
+        {isAuthenticating && (
+          <div className="text-center py-16">
+            <FiRefreshCw className="w-16 h-16 text-primary-600 mx-auto mb-4 animate-spin" />
+            <h3 className="text-lg font-semibold text-gray-900 mb-2">
+              Authenticating from Roundcube...
+            </h3>
+            <p className="text-gray-600 max-w-md mx-auto">
+              Please wait while we verify your session
+            </p>
           </div>
         )}
 
-        {/* Email Search Section - Only show if NOT in single email mode */}
-        {!singleEmailMode && (
-          <>
-            <div className="card mb-8">
-              <div className="flex items-start justify-between mb-4">
-                <div>
-                  <h2 className="text-2xl font-bold text-gray-900">Manage Email Rules</h2>
-                  <p className="text-sm text-gray-600 mt-1">
-                    Search for an email address to configure auto-replies and forwarding
-                  </p>
-                </div>
-                <button
-                  onClick={() => setShowAllRules(!showAllRules)}
-                  className="btn-secondary flex items-center gap-2"
-                >
-                  <FiList className="w-4 h-4" />
-                  All Rules ({allRules.length})
-                </button>
-              </div>
-
-              <div className="flex gap-2">
-                <div className="flex-1">
-                  <input
-                    type="email"
-                    value={email}
-                    onChange={(e) => {
-                      setEmail(e.target.value);
-                      setEmailError('');
-                    }}
-                    onKeyPress={handleKeyPress}
-                    placeholder="Enter email address (e.g., user@example.com)"
-                    className={`input-field ${emailError ? 'border-red-500 focus:ring-red-500' : ''}`}
-                  />
-                  {emailError && (
-                    <p className="mt-1 text-sm text-red-600">{emailError}</p>
-                  )}
-                </div>
-                <button
-                  onClick={handleSearch}
-                  disabled={isLoading}
-                  className="btn-primary flex items-center gap-2 whitespace-nowrap"
-                >
-                  {isLoading ? (
-                    <>
-                      <FiRefreshCw className="w-4 h-4 animate-spin" />
-                      Loading...
-                    </>
-                  ) : (
-                    <>
-                      <FiSearch className="w-4 h-4" />
-                      Search
-                    </>
-                  )}
-                </button>
-              </div>
+        {/* Access Denied / Invalid State */}
+        {!isAuthenticating && !currentRule && (
+          <div className="text-center py-16">
+            <div className="bg-red-100 rounded-full w-20 h-20 flex items-center justify-center mx-auto mb-6">
+              <svg className="w-10 h-10 text-red-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z" />
+              </svg>
             </div>
-
-            {/* All Rules List */}
-            {showAllRules && allRules.length > 0 && (
-              <div className="card mb-8">
-                <h3 className="text-lg font-semibold text-gray-900 mb-4">All Configured Rules</h3>
-                <div className="space-y-2 max-h-96 overflow-y-auto">
-                  {allRules.map((rule, index) => (
-                    <div
-                      key={index}
-                      onClick={() => handleSelectRule(rule.email_address)}
-                      className="flex items-center justify-between p-4 bg-gray-50 hover:bg-gray-100 border border-gray-200 rounded-lg cursor-pointer transition-colors"
-                    >
-                      <div>
-                        <p className="font-medium text-gray-900">{rule.email_address}</p>
-                        <div className="flex gap-3 mt-1 text-xs text-gray-600">
-                          <span className={rule.ooo_active ? 'text-green-600 font-semibold' : ''}>
-                            OOO: {rule.ooo_active ? 'Active' : 'Inactive'}
-                          </span>
-                          <span>Forwards: {rule.forwards?.length || 0}</span>
-                        </div>
-                      </div>
-                    </div>
-                  ))}
-                </div>
-              </div>
-            )}
-          </>
+            <h3 className="text-2xl font-bold text-gray-900 mb-2">
+              Access Denied
+            </h3>
+            <p className="text-gray-600 max-w-md mx-auto mb-8">
+              This application can only be accessed via the secure link provided in your Roundcube configuration.
+            </p>
+          </div>
         )}
 
         {/* Configuration Tabs */}
@@ -314,17 +245,15 @@ function App() {
               <nav className="flex gap-8">
                 <button
                   onClick={() => setActiveTab('ooo')}
-                  className={`pb-3 px-1 transition-colors ${
-                    activeTab === 'ooo' ? 'tab-active' : 'tab-inactive'
-                  }`}
+                  className={`pb-3 px-1 transition-colors ${activeTab === 'ooo' ? 'tab-active' : 'tab-inactive'
+                    }`}
                 >
                   Out of Office
                 </button>
                 <button
                   onClick={() => setActiveTab('forwarding')}
-                  className={`pb-3 px-1 transition-colors ${
-                    activeTab === 'forwarding' ? 'tab-active' : 'tab-inactive'
-                  }`}
+                  className={`pb-3 px-1 transition-colors ${activeTab === 'forwarding' ? 'tab-active' : 'tab-inactive'
+                    }`}
                 >
                   Email Forwarding
                 </button>
@@ -342,32 +271,6 @@ function App() {
             </div>
           </div>
         )}
-
-        {/* Empty State */}
-        {!currentRule && !showAllRules && !isAuthenticating && (
-          <div className="text-center py-16">
-            <FiSearch className="w-16 h-16 text-gray-300 mx-auto mb-4" />
-            <h3 className="text-lg font-semibold text-gray-900 mb-2">
-              Search for an email address
-            </h3>
-            <p className="text-gray-600 max-w-md mx-auto">
-              Enter an email address above to view and configure its out-of-office auto-replies and forwarding rules
-            </p>
-          </div>
-        )}
-
-        {/* Authenticating State */}
-        {isAuthenticating && (
-          <div className="text-center py-16">
-            <FiRefreshCw className="w-16 h-16 text-primary-600 mx-auto mb-4 animate-spin" />
-            <h3 className="text-lg font-semibold text-gray-900 mb-2">
-              Authenticating from Roundcube...
-            </h3>
-            <p className="text-gray-600 max-w-md mx-auto">
-              Please wait while we verify your session
-            </p>
-          </div>
-        )}
       </main>
 
       {/* Toast Notifications */}