first version

app/api/mailboxes/route.ts

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+import { NextRequest, NextResponse } from 'next/server';
+import { db } from '@/app/db/drizzle';
+import { domains, emails } from '@/app/db/schema';
+import { authenticate } from '@/app/lib/utils';
+import { eq, sql } from 'drizzle-orm';
+
+export async function GET(req: NextRequest) {
+  if (!authenticate(req)) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+
+  const { searchParams } = new URL(req.url);
+  const bucket = searchParams.get('bucket');
+  if (!bucket) return NextResponse.json({ error: 'Missing bucket' }, { status: 400 });
+
+  const [domain] = await db.select().from(domains).where(eq(domains.bucket, bucket));
+  if (!domain) return NextResponse.json({ error: 'Domain not found' }, { status: 404 });
+
+  const mailboxData = await db.select({ to: emails.to }).from(emails).where(eq(emails.domainId, domain.id));
+  const uniqueMailboxes = new Set<string>();
+  mailboxData.forEach(em => em.to?.forEach(r => uniqueMailboxes.add(r.toLowerCase())));
+
+  return NextResponse.json(Array.from(uniqueMailboxes));
+}