diff --git a/app/domains/page.tsx b/app/domains/page.tsx
index bbbb2fe..b736835 100644
--- a/app/domains/page.tsx
+++ b/app/domains/page.tsx
@@ -32,16 +32,23 @@ export default function Domains() {
   if (error) return <div className="min-h-screen flex items-center justify-center bg-gray-100 text-red-500">{error}</div>;
 
   return (
-    <div className="min-h-screen bg-gray-100 p-8">
-      <h1 className="text-3xl font-bold mb-6 text-center">Domains</h1>
-      <ul className="max-w-md mx-auto bg-white rounded-lg shadow-md divide-y divide-gray-200">
+    <div className="min-h-screen bg-gradient-to-b from-blue-50 to-gray-100 p-8">
+      <nav className="max-w-4xl mx-auto mb-6 bg-white p-4 rounded-lg shadow-sm">
+        <ol className="flex flex-wrap space-x-2 text-sm text-gray-500">
+          <li><Link href="/" className="hover:text-blue-600">Home</Link></li>
+          <li className="mx-1">/</li>
+          <li className="font-semibold text-gray-700">Domains</li>
+        </ol>
+      </nav>
+      <h1 className="text-4xl font-bold mb-8 text-center text-gray-800">Domains</h1>
+      <ul className="max-w-md mx-auto grid gap-4">
         {domains.length === 0 ? (
-          <li className="p-4 text-center text-gray-500">No domains found</li>
+          <li className="p-6 text-center text-gray-500 bg-white rounded-lg shadow-md">No domains found</li>
         ) : (
           domains.map((d: any) => (
-            <li key={d.bucket} className="p-4 hover:bg-gray-50 transition">
-              <Link href={`/mailboxes?bucket=${d.bucket}`} className="text-blue-500 hover:underline">
-                {d.domain}
+            <li key={d.bucket}>
+              <Link href={`/mailboxes?bucket=${d.bucket}`} className="block p-6 bg-white rounded-lg shadow-md hover:shadow-lg transition hover:bg-blue-50">
+                <span className="text-lg font-medium text-blue-600">{d.domain}</span>
               </Link>
             </li>
           ))
diff --git a/app/email/page.tsx b/app/email/page.tsx
index 4313a67..83e4afe 100644
--- a/app/email/page.tsx
+++ b/app/email/page.tsx
@@ -2,12 +2,13 @@
 
 import { useState, useEffect } from 'react';
 import { useSearchParams } from 'next/navigation';
-import ReactMarkdown from 'react-markdown';
+import Link from 'next/link';
 
 export default function EmailDetail() {
   const searchParams = useSearchParams();
   const bucket = searchParams.get('bucket');
   const key = searchParams.get('key');
+  const mailbox = searchParams.get('mailbox');  // Für Breadcrumb
   const [email, setEmail] = useState({ subject: '', from: '', to: '', html: '', raw: '', processed: '' });
   const [viewMode, setViewMode] = useState('html');
   const [error, setError] = useState<string | null>(null);
@@ -42,33 +43,45 @@ export default function EmailDetail() {
   if (error) return <div className="min-h-screen flex items-center justify-center bg-gray-100 text-red-500">{error}</div>;
 
   return (
-    <div className="min-h-screen bg-gray-100 p-8">
-      <div className="max-w-4xl mx-auto bg-white rounded-lg shadow-md p-6">
-        <h1 className="text-3xl font-bold mb-4">{email.subject}</h1>
-        <p className="text-gray-700 mb-2"><strong>From:</strong> {email.from}</p>
-        <p className="text-gray-700 mb-2"><strong>To:</strong> {email.to}</p>
-        <p className="text-gray-700 mb-4"><strong>Processed:</strong> {email.processed}</p>
-        <div className="flex mb-4">
+    <div className="min-h-screen bg-gradient-to-b from-blue-50 to-gray-100 p-8">
+      <nav className="max-w-4xl mx-auto mb-6 bg-white p-4 rounded-lg shadow-sm">
+        <ol className="flex flex-wrap space-x-2 text-sm text-gray-500">
+          <li><Link href="/" className="hover:text-blue-600">Home</Link></li>
+          <li className="mx-1">/</li>
+          <li><Link href="/domains" className="hover:text-blue-600">Domains</Link></li>
+          <li className="mx-1">/</li>
+          <li><Link href={`/mailboxes?bucket=${bucket}`} className="hover:text-blue-600">Mailboxes</Link></li>
+          <li className="mx-1">/</li>
+          <li><Link href={`/emails?bucket=${bucket}&mailbox=${encodeURIComponent(mailbox || '')}`} className="hover:text-blue-600">Emails</Link></li>
+          <li className="mx-1">/</li>
+          <li className="font-semibold text-gray-700">Detail</li>
+        </ol>
+      </nav>
+      <div className="max-w-4xl mx-auto bg-white rounded-lg shadow-md p-8">
+        <h1 className="text-4xl font-bold mb-6 text-gray-800">{email.subject}</h1>
+        <p className="text-gray-700 mb-2 text-lg"><strong>From:</strong> {email.from}</p>
+        <p className="text-gray-700 mb-2 text-lg"><strong>To:</strong> {email.to}</p>
+        <p className="text-gray-700 mb-2 text-lg"><strong>S3 Key:</strong> {key}</p>
+        <p className="text-gray-700 mb-6 text-lg"><strong>Processed:</strong> {email.processed}</p>
+        <div className="flex mb-6 space-x-2">
           <button 
             onClick={() => setViewMode('html')} 
-            className={`px-4 py-2 rounded-l ${viewMode === 'html' ? 'bg-blue-500 text-white' : 'bg-gray-200 text-gray-700'} hover:bg-blue-600 transition`}
+            className={`px-6 py-3 rounded-md font-medium ${viewMode === 'html' ? 'bg-blue-600 text-white' : 'bg-gray-200 text-gray-700'} hover:bg-blue-700 transition`}
           >
             HTML
           </button>
           <button 
             onClick={() => setViewMode('raw')} 
-            className={`px-4 py-2 rounded-r ${viewMode === 'raw' ? 'bg-blue-500 text-white' : 'bg-gray-200 text-gray-700'} hover:bg-blue-600 transition`}
+            className={`px-6 py-3 rounded-md font-medium ${viewMode === 'raw' ? 'bg-blue-600 text-white' : 'bg-gray-200 text-gray-700'} hover:bg-blue-700 transition`}
           >
             RAW
           </button>
         </div>
-        <div className="border border-gray-300 p-4 rounded bg-white overflow-auto max-h-96">
+        <div className="border border-gray-300 p-6 rounded-lg bg-white overflow-auto max-h-[600px] shadow-inner">
           {viewMode === 'html' ? (
-            <div className="prose">
-              <ReactMarkdown>{email.html}</ReactMarkdown>
-            </div>
+            <div dangerouslySetInnerHTML={{ __html: email.html }} className="prose prose-lg max-w-none" />
           ) : (
-            <pre className="whitespace-pre-wrap text-sm">{email.raw}</pre>
+            <pre className="whitespace-pre-wrap text-sm font-mono bg-gray-50 p-4 rounded">{email.raw}</pre>
           )}
         </div>
       </div>
diff --git a/app/emails/page.tsx b/app/emails/page.tsx
index 56c5589..b6044db 100644
--- a/app/emails/page.tsx
+++ b/app/emails/page.tsx
@@ -40,7 +40,11 @@ export default function Emails() {
         if (!res.ok) throw new Error('Failed to fetch emails');
         return res.json();
       })
-      .then(setEmails)
+      .then(data => {
+        // Sortiere nach date descending
+        const sorted = data.sort((a: Email, b: Email) => new Date(b.date).getTime() - new Date(a.date).getTime());
+        setEmails(sorted);
+      })
       .catch(err => setError(err.message))
       .finally(() => setLoading(false));
   }, [bucket, mailbox]);
@@ -48,6 +52,11 @@ export default function Emails() {
   if (loading) return <div className="min-h-screen flex items-center justify-center bg-gray-100">Loading...</div>;
   if (error) return <div className="min-h-screen flex items-center justify-center bg-gray-100 text-red-500">{error}</div>;
 
+  const formatDate = (dateStr: string) => {
+    const date = new Date(dateStr);
+    return date.toLocaleString('en-US', { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false });
+  };
+
   const handleResendAll = async () => {
     const auth = localStorage.getItem('auth');
     if (!auth) return setMessage('Not authenticated');
@@ -87,32 +96,45 @@ export default function Emails() {
   };
 
   return (
-    <div className="min-h-screen bg-gray-100 p-8">
-      <h1 className="text-3xl font-bold mb-6 text-center">Emails for {mailbox} in {bucket}</h1>
+    <div className="min-h-screen bg-gradient-to-b from-blue-50 to-gray-100 p-8">
+      <nav className="max-w-4xl mx-auto mb-6 bg-white p-4 rounded-lg shadow-sm">
+        <ol className="flex flex-wrap space-x-2 text-sm text-gray-500">
+          <li><Link href="/" className="hover:text-blue-600">Home</Link></li>
+          <li className="mx-1">/</li>
+          <li><Link href="/domains" className="hover:text-blue-600">Domains</Link></li>
+          <li className="mx-1">/</li>
+          <li><Link href={`/mailboxes?bucket=${bucket}`} className="hover:text-blue-600">Mailboxes</Link></li>
+          <li className="mx-1">/</li>
+          <li className="font-semibold text-gray-700">Emails</li>
+        </ol>
+      </nav>
+      <h1 className="text-4xl font-bold mb-8 text-center text-gray-800">Emails for {mailbox} in {bucket}</h1>
       <div className="flex justify-center mb-6">
         <button 
           onClick={handleResendAll} 
-          className="bg-green-500 text-white px-6 py-3 rounded hover:bg-green-600 transition"
+          className="bg-green-500 text-white px-8 py-3 rounded-lg hover:bg-green-600 transition shadow-md"
         >
           Resend all unprocessed
         </button>
       </div>
-      {message && <p className="text-center mb-4 text-blue-500">{message}</p>}
+      {message && <p className="text-center mb-6 text-blue-600 font-medium">{message}</p>}
       <div className="overflow-x-auto max-w-4xl mx-auto bg-white rounded-lg shadow-md">
         <table className="min-w-full divide-y divide-gray-200">
-          <thead className="bg-gray-50">
+          <thead className="bg-blue-50">
             <tr>
-              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Subject</th>
-              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Date</th>
-              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Processed</th>
-              <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Actions</th>
+              <th className="px-6 py-3 text-left text-xs font-medium text-gray-700 uppercase tracking-wider">Subject</th>
+              <th className="px-6 py-3 text-left text-xs font-medium text-gray-700 uppercase tracking-wider">Date</th>
+              <th className="px-6 py-3 text-left text-xs font-medium text-gray-700 uppercase tracking-wider">S3 Key</th>
+              <th className="px-6 py-3 text-left text-xs font-medium text-gray-700 uppercase tracking-wider">Processed</th>
+              <th className="px-6 py-3 text-left text-xs font-medium text-gray-700 uppercase tracking-wider">Actions</th>
             </tr>
           </thead>
           <tbody className="bg-white divide-y divide-gray-200">
             {emails.map((e: Email) => (
-              <tr key={e.key} className="hover:bg-gray-50 transition">
+              <tr key={e.key} className="hover:bg-blue-50 transition">
                 <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900">{e.subject}</td>
-                <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">{e.date}</td>
+                <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">{formatDate(e.date)}</td>
+                <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500 truncate max-w-xs">{e.key}</td>
                 <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500">
                   <input 
                     type="checkbox" 
@@ -122,7 +144,7 @@ export default function Emails() {
                   />
                 </td>
                 <td className="px-6 py-4 whitespace-nowrap text-sm font-medium">
-                  <Link href={`/email?bucket=${bucket}&key=${e.key}`} className="text-blue-600 hover:text-blue-900 mr-4">
+                  <Link href={`/email?bucket=${bucket}&key=${e.key}&mailbox=${encodeURIComponent(mailbox || '')}`} className="text-blue-600 hover:text-blue-900 mr-4">
                     View
                   </Link>
                   <button onClick={() => handleResend(e.key)} className="text-green-600 hover:text-green-900">
diff --git a/app/globals.css b/app/globals.css
index bd6213e..674330b 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -1,3 +1,7 @@
 @tailwind base;
 @tailwind components;
-@tailwind utilities;
\ No newline at end of file
+@tailwind utilities;
+
+li {
+    list-style-type: none;
+}
\ No newline at end of file
diff --git a/app/lib/sync.ts b/app/lib/sync.ts
index 30dc2f0..2d6e272 100644
--- a/app/lib/sync.ts
+++ b/app/lib/sync.ts
@@ -2,93 +2,288 @@ import { db } from '@/app/db/drizzle';
 import { domains, emails } from '@/app/db/schema';
 import { getS3Client, getBody } from '@/app/lib/utils';
 import { simpleParser } from 'mailparser';
-import { ListBucketsCommand, ListObjectsV2Command, GetObjectCommand, HeadObjectCommand } from '@aws-sdk/client-s3';
-import { eq, sql } from 'drizzle-orm';
+import { ListBucketsCommand, ListObjectsV2Command, GetObjectCommand, HeadObjectCommand, S3Client } from '@aws-sdk/client-s3';
+import { eq, sql, inArray } from 'drizzle-orm';
 import { Readable } from 'stream';
-import pRetry from 'p-retry';  // Für Retry bei Timeouts
+import pLimit from 'p-limit';  // Für parallele Verarbeitung mit Limit
+import pRetry from 'p-retry';
+
+// Konfigurierbare Konstanten
+const CONCURRENT_S3_OPERATIONS = 10;  // Parallele S3 Operationen
+const BATCH_INSERT_SIZE = 100;  // Batch-Größe für DB Inserts
+const CONCURRENT_EMAIL_PARSING = 5;  // Parallele E-Mail Parser
 
 export async function syncAllDomains() {
-  console.log('Starting syncAllDomains...');
+  console.log('Starting optimized syncAllDomains...');
+  const startTime = Date.now();
+  
   const s3 = getS3Client();
-  const { Buckets } = await pRetry(() => s3.send(new ListBucketsCommand({})), { retries: 3 });  // Retry bei Fail
+  const { Buckets } = await pRetry(() => s3.send(new ListBucketsCommand({})), { retries: 3 });
   const domainBuckets = Buckets?.filter(b => b.Name?.endsWith('-emails')) || [];
-  console.log('Found domain buckets:', domainBuckets.map(b => b.Name).join(', ') || 'None');
+  console.log(`Found ${domainBuckets.length} domain buckets`);
 
-  for (const bucketObj of domainBuckets) {
-    const bucket = bucketObj.Name!;
-    const domainName = bucket.replace('-emails', '').replace(/-/g, '.');
-    console.log(`Processing bucket: ${bucket} (domain: ${domainName})`);
+  // Parallele Verarbeitung der Buckets
+  const bucketLimit = pLimit(3); // Max 3 Buckets parallel
+  
+  await Promise.all(
+    domainBuckets.map(bucketObj => 
+      bucketLimit(async () => {
+        const bucket = bucketObj.Name!;
+        const domainName = bucket.replace('-emails', '').replace(/-/g, '.');
+        console.log(`Processing bucket: ${bucket}`);
 
-    // Upsert Domain
-    const existingDomain = await db.select().from(domains).where(eq(domains.bucket, bucket)).limit(1);
-    console.log(`Existing domain for ${bucket}: ${existingDomain.length > 0 ? 'Yes (ID: ' + existingDomain[0].id + ')' : 'No'}`);
-    let domainId;
-    if (existingDomain.length === 0) {
-      const [newDomain] = await db.insert(domains).values({ bucket, domain: domainName }).returning({ id: domains.id });
-      domainId = newDomain.id;
-      console.log(`Created new domain ID: ${domainId}`);
-    } else {
-      domainId = existingDomain[0].id;
-    }
+        // Upsert Domain
+        const [domain] = await db
+          .insert(domains)
+          .values({ bucket, domain: domainName })
+          .onConflictDoUpdate({
+            target: domains.bucket,
+            set: { domain: domainName }
+          })
+          .returning({ id: domains.id });
 
-    // Sync Emails
-    await syncEmailsForDomain(domainId, bucket);
-  }
-  console.log('syncAllDomains completed.');
+        await syncEmailsForDomainOptimized(domain.id, bucket, s3);
+      })
+    )
+  );
+  
+  const duration = (Date.now() - startTime) / 1000;
+  console.log(`syncAllDomains completed in ${duration}s`);
 }
 
-async function syncEmailsForDomain(domainId: number, bucket: string) {
-  console.log(`Starting syncEmailsForDomain for bucket: ${bucket} (domainId: ${domainId})`);
-  const s3 = getS3Client();
-  const { Contents } = await pRetry(() => s3.send(new ListObjectsV2Command({ Bucket: bucket })), { retries: 3 });
-  console.log(`Found objects in bucket: ${Contents?.length || 0}`);
-
-  for (const obj of Contents || []) {
-    if (!obj.Key) continue;
-    console.log(`Processing object: ${obj.Key}`);
-
-    // Check if exists
-    const existing = await db.select().from(emails).where(eq(emails.s3Key, obj.Key!)).limit(1);
-    console.log(`Existing email for ${obj.Key}: ${existing.length > 0 ? 'Yes' : 'No'}`);
-    if (existing.length > 0) {
-      // Update processed if changed
-      const head = await pRetry(() => s3.send(new HeadObjectCommand({ Bucket: bucket, Key: obj.Key })), { retries: 3 });
-      const processed = head.Metadata?.[process.env.PROCESSED_META_KEY!] === process.env.PROCESSED_META_VALUE!;
-      console.log(`Processed metadata for ${obj.Key}: ${processed} (DB: ${existing[0].processed})`);
-      if (existing[0].processed !== processed) {
-        await db.update(emails).set({ processed }).where(eq(emails.s3Key, obj.Key!));
-        console.log(`Updated processed for ${obj.Key}`);
-      }
-      await new Promise(resolve => setTimeout(resolve, 100));  // Kleine Delay gegen Throttling
-      continue;
+async function syncEmailsForDomainOptimized(domainId: number, bucket: string, s3: S3Client) {
+  console.log(`Starting optimized sync for bucket: ${bucket}`);
+  const startTime = Date.now();
+  
+  // 1. Hole alle S3 Keys auf einmal
+  let allS3Keys: string[] = [];
+  let continuationToken: string | undefined;
+  
+  do {
+    const response = await pRetry(
+      () => s3.send(new ListObjectsV2Command({ 
+        Bucket: bucket,
+        MaxKeys: 1000,  // Maximum per Request
+        ContinuationToken: continuationToken 
+      })),
+      { retries: 3 }
+    );
+    
+    allS3Keys.push(...(response.Contents?.map(obj => obj.Key!).filter(Boolean) || []));
+    continuationToken = response.NextContinuationToken;
+  } while (continuationToken);
+  
+  console.log(`Found ${allS3Keys.length} objects in bucket`);
+  
+  if (allS3Keys.length === 0) return;
+  
+  // 2. Hole alle existierenden E-Mails aus der DB in einem Query
+  const existingEmails = await db
+    .select({
+      s3Key: emails.s3Key,
+      processed: emails.processed
+    })
+    .from(emails)
+    .where(inArray(emails.s3Key, allS3Keys));
+  
+  const existingKeysMap = new Map(
+    existingEmails.map(e => [e.s3Key, e.processed])
+  );
+  
+  console.log(`Found ${existingEmails.length} existing emails in DB`);
+  
+  // 3. Bestimme was zu tun ist
+  const toInsert: string[] = [];
+  const toCheckProcessed: string[] = [];
+  
+  for (const key of allS3Keys) {
+    if (!existingKeysMap.has(key)) {
+      toInsert.push(key);
+    } else {
+      toCheckProcessed.push(key);
     }
-
-    // New: Parse and insert
-    console.log(`Parsing new email: ${obj.Key}`);
-    const { Body } = await pRetry(() => s3.send(new GetObjectCommand({ Bucket: bucket, Key: obj.Key })), { retries: 3 });
-    const raw = await getBody(Body as Readable);
-    const parsed = await simpleParser(raw);
-    const head = await pRetry(() => s3.send(new HeadObjectCommand({ Bucket: bucket, Key: obj.Key })), { retries: 3 });
-
-    const to = parsed.to ? (Array.isArray(parsed.to) ? parsed.to.flatMap(t => t.value.map(v => v.address?.toLowerCase() || '')) : parsed.to.value.map(v => v.address?.toLowerCase() || '')) : [];
-    const cc = parsed.cc ? (Array.isArray(parsed.cc) ? parsed.cc.flatMap(c => c.value.map(v => v.address?.toLowerCase() || '')) : parsed.cc.value.map(v => v.address?.toLowerCase() || '')) : [];
-    const bcc = parsed.bcc ? (Array.isArray(parsed.bcc) ? parsed.bcc.flatMap(b => b.value.map(v => v.address?.toLowerCase() || '')) : parsed.bcc.value.map(v => v.address?.toLowerCase() || '')) : [];
-
-    await db.insert(emails).values({
-      domainId,
-      s3Key: obj.Key!,
-      from: parsed.from?.value[0].address,
-      to,
-      cc,
-      bcc,
-      subject: parsed.subject,
-      html: parsed.html || parsed.textAsHtml,
-      raw: raw.toString('utf-8'),
-      processed: head.Metadata?.[process.env.PROCESSED_META_KEY!] === process.env.PROCESSED_META_VALUE!,
-      date: parsed.date || obj.LastModified,
-    });
-    console.log(`Inserted new email: ${obj.Key}`);
-    await new Promise(resolve => setTimeout(resolve, 100));  // Delay gegen Throttling
   }
-  console.log(`syncEmailsForDomain completed for bucket: ${bucket}`);
+  
+  console.log(`To insert: ${toInsert.length}, To check: ${toCheckProcessed.length}`);
+  
+  // 4. Parallele Verarbeitung der Updates (Processed Status)
+  if (toCheckProcessed.length > 0) {
+    const updateLimit = pLimit(CONCURRENT_S3_OPERATIONS);
+    const updatePromises = toCheckProcessed.map(key =>
+      updateLimit(async () => {
+        try {
+          const head = await s3.send(new HeadObjectCommand({ Bucket: bucket, Key: key }));
+          const processed = head.Metadata?.[process.env.PROCESSED_META_KEY!] === process.env.PROCESSED_META_VALUE!;
+          const currentProcessed = existingKeysMap.get(key);
+          
+          if (currentProcessed !== processed) {
+            await db
+              .update(emails)
+              .set({ processed })
+              .where(eq(emails.s3Key, key));
+            console.log(`Updated processed status for ${key}`);
+          }
+        } catch (error) {
+          console.error(`Error checking ${key}:`, error);
+        }
+      })
+    );
+    
+    await Promise.all(updatePromises);
+  }
+  
+  // 5. Batch-Insert für neue E-Mails
+  if (toInsert.length > 0) {
+    console.log(`Processing ${toInsert.length} new emails...`);
+    
+    // Verarbeite in Batches
+    for (let i = 0; i < toInsert.length; i += BATCH_INSERT_SIZE) {
+      const batch = toInsert.slice(i, i + BATCH_INSERT_SIZE);
+      console.log(`Processing batch ${Math.floor(i/BATCH_INSERT_SIZE) + 1}/${Math.ceil(toInsert.length/BATCH_INSERT_SIZE)}`);
+      
+      // Paralleles Fetching und Parsing
+      const parseLimit = pLimit(CONCURRENT_EMAIL_PARSING);
+      const emailDataPromises = batch.map(key =>
+        parseLimit(async () => {
+          try {
+            // Hole Objekt und Metadata parallel
+            const [getObjResponse, headResponse] = await Promise.all([
+              pRetry(() => s3.send(new GetObjectCommand({ Bucket: bucket, Key: key })), { retries: 2 }),
+              pRetry(() => s3.send(new HeadObjectCommand({ Bucket: bucket, Key: key })), { retries: 2 })
+            ]);
+            
+            const raw = await getBody(getObjResponse.Body as Readable);
+            const parsed = await simpleParser(raw, {
+              skipHtmlToText: true,  // Schneller, wenn Text nicht benötigt
+              skipTextContent: false,
+              skipImageLinks: true
+            });
+            
+            const to = extractAddresses(parsed.to);
+            const cc = extractAddresses(parsed.cc);
+            const bcc = extractAddresses(parsed.bcc);
+            
+            return {
+              domainId,
+              s3Key: key,
+              from: parsed.from?.value[0]?.address,
+              to,
+              cc,
+              bcc,
+              subject: parsed.subject,
+              html: parsed.html || parsed.textAsHtml,
+              raw: raw.toString('utf-8'),
+              processed: headResponse.Metadata?.[process.env.PROCESSED_META_KEY!] === process.env.PROCESSED_META_VALUE!,
+              date: parsed.date || headResponse.LastModified,
+            };
+          } catch (error) {
+            console.error(`Error processing ${key}:`, error);
+            return null;
+          }
+        })
+      );
+      
+      const emailData = (await Promise.all(emailDataPromises)).filter(Boolean);
+      
+      // Batch Insert
+      if (emailData.length > 0) {
+        await db.insert(emails).values(emailData);
+        console.log(`Inserted ${emailData.length} emails`);
+      }
+    }
+  }
+  
+  const duration = (Date.now() - startTime) / 1000;
+  console.log(`Sync for ${bucket} completed in ${duration}s`);
+}
+
+// Helper Funktion für Address-Extraktion
+function extractAddresses(addressObj: any): string[] {
+  if (!addressObj) return [];
+  if (Array.isArray(addressObj)) {
+    return addressObj.flatMap(t => t.value.map((v: any) => v.address?.toLowerCase() || '')).filter(Boolean);
+  }
+  return addressObj.value?.map((v: any) => v.address?.toLowerCase() || '').filter(Boolean) || [];
+}
+
+// Optimierte Version mit Stream-Processing für sehr große Buckets
+export async function syncEmailsForDomainStreaming(domainId: number, bucket: string, s3: S3Client) {
+  console.log(`Starting streaming sync for bucket: ${bucket}`);
+  
+  // Verwende S3 Select für große Datensätze (falls unterstützt)
+  // Dies reduziert die übertragene Datenmenge erheblich
+  
+  const existingKeys = new Set(
+    (await db
+      .select({ s3Key: emails.s3Key })
+      .from(emails)
+      .where(eq(emails.domainId, domainId))
+    ).map(e => e.s3Key)
+  );
+  
+  const processQueue: any[] = [];
+  const QUEUE_SIZE = 50;
+  
+  // Stream-basierte Verarbeitung
+  let continuationToken: string | undefined;
+  
+  do {
+    const response = await s3.send(new ListObjectsV2Command({ 
+      Bucket: bucket,
+      MaxKeys: 100,
+      ContinuationToken: continuationToken 
+    }));
+    
+    const newKeys = response.Contents?.filter(obj => 
+      obj.Key && !existingKeys.has(obj.Key)
+    ) || [];
+    
+    // Verarbeite parallel während wir weitere Keys holen
+    if (newKeys.length > 0) {
+      const batch = newKeys.slice(0, QUEUE_SIZE);
+      // Prozessiere Batch async (ohne await)
+      processBatchAsync(batch, bucket, domainId, s3);
+    }
+    
+    continuationToken = response.NextContinuationToken;
+  } while (continuationToken);
+}
+
+async function processBatchAsync(batch: any[], bucket: string, domainId: number, s3: S3Client) {
+  // Async Batch Processing ohne den Hauptthread zu blockieren
+  const emailData = await Promise.all(
+    batch.map(async (obj) => {
+      try {
+        const [getObjResponse, headResponse] = await Promise.all([
+          s3.send(new GetObjectCommand({ Bucket: bucket, Key: obj.Key })),
+          s3.send(new HeadObjectCommand({ Bucket: bucket, Key: obj.Key }))
+        ]);
+        
+        const raw = await getBody(getObjResponse.Body as Readable);
+        const parsed = await simpleParser(raw);
+        
+        return {
+          domainId,
+          s3Key: obj.Key,
+          from: parsed.from?.value[0]?.address,
+          to: extractAddresses(parsed.to),
+          cc: extractAddresses(parsed.cc),
+          bcc: extractAddresses(parsed.bcc),
+          subject: parsed.subject,
+          html: parsed.html || parsed.textAsHtml,
+          raw: raw.toString('utf-8'),
+          processed: headResponse.Metadata?.[process.env.PROCESSED_META_KEY!] === process.env.PROCESSED_META_VALUE!,
+          date: parsed.date || obj.LastModified,
+        };
+      } catch (error) {
+        console.error(`Error processing ${obj.Key}:`, error);
+        return null;
+      }
+    })
+  );
+  
+  const validData = emailData.filter(Boolean);
+  if (validData.length > 0) {
+    await db.insert(emails).values(validData);
+  }
 }
\ No newline at end of file
diff --git a/app/lib/utils.ts b/app/lib/utils.ts
index 4e3d231..218a786 100644
--- a/app/lib/utils.ts
+++ b/app/lib/utils.ts
@@ -1,17 +1,25 @@
 import { S3Client } from '@aws-sdk/client-s3';
+import { NodeHttpHandler } from '@smithy/node-http-handler';
 import { NextRequest } from 'next/server';
 import { Readable } from 'stream';
+import https from 'https';
 
 export function getS3Client() {
-  console.log('Creating S3Client...');
-  console.log('AWS_REGION:', process.env.AWS_REGION);
-  console.log('AWS_ACCESS_KEY_ID:', process.env.AWS_ACCESS_KEY_ID ? 'Set' : 'Not set');  // Maskiere sensible Infos
-  console.log('AWS_SECRET_ACCESS_KEY:', process.env.AWS_SECRET_ACCESS_KEY ? 'Set' : 'Not set');
-
   return new S3Client({
     region: process.env.AWS_REGION,
-    credentials: { accessKeyId: process.env.AWS_ACCESS_KEY_ID!, secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY! },
-    httpOptions: { connectTimeout: 60000, timeout: 60000 },  // 60s, verhindert Timeouts
+    credentials: { 
+      accessKeyId: process.env.AWS_ACCESS_KEY_ID!, 
+      secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY! 
+    },
+    maxAttempts: 3,
+    requestHandler: new NodeHttpHandler({
+      connectionTimeout: 10000,
+      socketTimeout: 60000,
+      httpsAgent: new https.Agent({
+        keepAlive: true,
+        maxSockets: 50  // Erhöhe parallele Verbindungen
+      })
+    })
   });
 }
 
diff --git a/app/mailboxes/page.tsx b/app/mailboxes/page.tsx
index 3f4e1f0..1464ae6 100644
--- a/app/mailboxes/page.tsx
+++ b/app/mailboxes/page.tsx
@@ -40,16 +40,25 @@ export default function Mailboxes() {
   if (error) return <div className="min-h-screen flex items-center justify-center bg-gray-100 text-red-500">{error}</div>;
 
   return (
-    <div className="min-h-screen bg-gray-100 p-8">
-      <h1 className="text-3xl font-bold mb-6 text-center">Mailboxes for {bucket}</h1>
-      <ul className="max-w-md mx-auto bg-white rounded-lg shadow-md divide-y divide-gray-200">
+    <div className="min-h-screen bg-gradient-to-b from-blue-50 to-gray-100 p-8">
+      <nav className="max-w-4xl mx-auto mb-6 bg-white p-4 rounded-lg shadow-sm">
+        <ol className="flex flex-wrap space-x-2 text-sm text-gray-500">
+          <li><Link href="/" className="hover:text-blue-600">Home</Link></li>
+          <li className="mx-1">/</li>
+          <li><Link href="/domains" className="hover:text-blue-600">Domains</Link></li>
+          <li className="mx-1">/</li>
+          <li className="font-semibold text-gray-700">Mailboxes</li>
+        </ol>
+      </nav>
+      <h1 className="text-4xl font-bold mb-8 text-center text-gray-800">Mailboxes for {bucket}</h1>
+      <ul className="max-w-md mx-auto grid gap-4">
         {mailboxes.length === 0 ? (
-          <li className="p-4 text-center text-gray-500">No mailboxes found</li>
+          <li className="p-6 text-center text-gray-500 bg-white rounded-lg shadow-md">No mailboxes found</li>
         ) : (
           mailboxes.map((m: string) => (
-            <li key={m} className="p-4 hover:bg-gray-50 transition">
-              <Link href={`/emails?bucket=${bucket}&mailbox=${encodeURIComponent(m)}`} className="text-blue-500 hover:underline">
-                {m}
+            <li key={m}>
+              <Link href={`/emails?bucket=${bucket}&mailbox=${encodeURIComponent(m)}`} className="block p-6 bg-white rounded-lg shadow-md hover:shadow-lg transition hover:bg-blue-50">
+                <span className="text-lg font-medium text-blue-600">{m}</span>
               </Link>
             </li>
           ))
diff --git a/app/page.tsx b/app/page.tsx
index 74a1ed7..677dfad 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -28,19 +28,19 @@ export default function Home() {
 
   if (!loggedIn) {
     return (
-      <div className="min-h-screen flex items-center justify-center bg-gray-100">
-        <div className="bg-white p-8 rounded-lg shadow-md w-96">
-          <h1 className="text-2xl font-bold mb-6 text-center">Login</h1>
+      <div className="min-h-screen flex items-center justify-center bg-gradient-to-b from-blue-50 to-gray-100">
+        <div className="bg-white p-10 rounded-xl shadow-xl w-96">
+          <h1 className="text-3xl font-bold mb-8 text-center text-gray-800">Login to Mail S3 Admin</h1>
           <input 
             type="password" 
             value={password} 
             onChange={e => setPassword(e.target.value)} 
-            className="border border-gray-300 p-3 mb-4 w-full rounded focus:outline-none focus:ring-2 focus:ring-blue-500" 
+            className="border border-gray-300 p-4 mb-6 w-full rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500" 
             placeholder="Enter password"
           />
           <button 
             onClick={handleLogin} 
-            className="bg-blue-500 text-white p-3 rounded w-full hover:bg-blue-600 transition"
+            className="bg-blue-600 text-white p-4 rounded-lg w-full hover:bg-blue-700 transition font-medium"
           >
             Login
           </button>
@@ -50,10 +50,10 @@ export default function Home() {
   }
 
   return (
-    <div className="min-h-screen bg-gray-100 p-8">
-      <h1 className="text-3xl font-bold mb-6 text-center">Mail S3 Admin</h1>
+    <div className="min-h-screen bg-gradient-to-b from-blue-50 to-gray-100 p-8">
+      <h1 className="text-4xl font-bold mb-8 text-center text-gray-800">Mail S3 Admin</h1>
       <div className="flex justify-center">
-        <Link href="/domains" className="bg-blue-500 text-white px-6 py-3 rounded hover:bg-blue-600 transition">
+        <Link href="/domains" className="bg-blue-600 text-white px-8 py-4 rounded-lg hover:bg-blue-700 transition shadow-md font-medium">
           Go to Domains
         </Link>
       </div>
diff --git a/package.json b/package.json
index df4dfe1..739bbff 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@aws-sdk/client-s3": "^3.888.0",
+    "@smithy/node-http-handler": "^4.2.1",
     "dotenv": "^17.2.2",
     "drizzle-orm": "^0.44.5",
     "email-addresses": "^5.0.0",
@@ -19,6 +20,7 @@
     "next": "15.5.3",
     "node-cron": "^4.2.1",
     "nodemailer": "^7.0.6",
+    "p-limit": "^7.1.1",
     "p-retry": "^7.0.0",
     "pg": "^8.16.3",
     "postgres": "^3.4.7",