diff --git a/.github/scripts/packed-consumer.mjs b/.github/scripts/packed-consumer.mjs
index bd10bc362..2cc4d2310 100644
--- a/.github/scripts/packed-consumer.mjs
+++ b/.github/scripts/packed-consumer.mjs
@@ -272,6 +272,11 @@ try {
           join(fixture, 'routes/api/packed.ts'),
           `import { defineHandler } from 'void';\nimport { kv } from 'void/kv';\nexport const GET = defineHandler(async () => { await kv.put('packed', 'ok'); return { value: await kv.get('packed') }; });\n`,
         );
+        // void/email pulls a CommonJS dependency into the Worker; only an installed package shows whether dev serves it.
+        writeFileSync(
+          join(fixture, 'routes/api/packed-email.ts'),
+          `import { defineHandler } from 'void';\nimport { sendEmail } from 'void/email';\nexport const GET = defineHandler(async () => { return sendEmail({ from: 'packed@example.com', to: 'inbox@example.com', subject: 'Packed', text: 'ok' }); });\n`,
+        );
         mkdirSync(join(fixture, 'public'), { recursive: true });
         writeFileSync(join(fixture, 'public/packed.txt'), label);
         const vite = join(fixture, 'node_modules/vite/bin/vite.js');
@@ -335,6 +340,16 @@ if (runtime.manifest.platformVersion !== ${JSON.stringify(version)}) throw new E
             const apiBody = await apiResponse.text();
             assert.equal(apiResponse.status, 200, `${apiBody}\n${task.failure()}`);
             assert.deepEqual(JSON.parse(apiBody), { value: 'ok' });
+            const emailResponse = await fetch(`${base}/api/packed-email`);
+            const emailBody = await emailResponse.text();
+            assert.equal(emailResponse.status, 200, `${emailBody}\n${task.failure()}`);
+            // Preview runs the built Worker: no dev inbox and no send binding.
+            const email = JSON.parse(emailBody);
+            if (mode === 'dev') {
+              assert.equal(email.ok, true, emailBody);
+            } else {
+              assert.equal(email.error?.code, 'BINDING_MISSING', emailBody);
+            }
             if (full && framework === 'react') {
               const markdown = await fetch(`${base}/markdown`);
               assert.equal(markdown.status, 200, task.failure());
@@ -375,7 +390,7 @@ if (runtime.manifest.platformVersion !== ${JSON.stringify(version)}) throw new E
           }
         }
         console.log(
-          `Passed packed ${label} (${suite}): init, frozen install, public Vite build/typecheck, assets, KV, runtime integrity${full ? ', dev/preview, hydration/navigation' : ', dev HTTP'}`,
+          `Passed packed ${label} (${suite}): init, frozen install, public Vite build/typecheck, assets, KV, email, runtime integrity${full ? ', dev/preview, hydration/navigation' : ', dev HTTP'}`,
         );
       } catch (error) {
         failures.push({ fixture: label, error: String(error.stack ?? error) });
diff --git a/packages/void/src/index.ts b/packages/void/src/index.ts
index ae26ec0f9..26384479c 100644
--- a/packages/void/src/index.ts
+++ b/packages/void/src/index.ts
@@ -208,7 +208,9 @@ export function voidPlugin(options?: {
   // graph and therefore another envContext, so request bindings disappear for
   // the prebundled copy. Every return path includes this plugin, including
   // framework and Node targets that do not all use bindingRuntimePlugin.
-  const serverRuntimeOptimizerPlugin = createServerRuntimeOptimizerPlugin();
+  const serverRuntimeOptimizerPlugin = createServerRuntimeOptimizerPlugin(
+    !isNodeTarget(config.target) && !frameworkOwnsCloudflareRuntime,
+  );
   // Scan queues/websocket routes early so both framework-mode and default-mode
   // branches can safely close over these bindings.
   const queues = framework ? [] : application.queues;
diff --git a/packages/void/src/plugin-worker-environment.ts b/packages/void/src/plugin-worker-environment.ts
index 5e12785b7..020b09a24 100644
--- a/packages/void/src/plugin-worker-environment.ts
+++ b/packages/void/src/plugin-worker-environment.ts
@@ -130,13 +130,26 @@ export function createWranglerCompatPersistPlugin(
   };
 }
 
-export function createServerRuntimeOptimizerPlugin(): Plugin {
+export function createServerRuntimeOptimizerPlugin(voidOwnsWorkerRuntime: boolean): Plugin {
   const serverRuntimeOptimizerPlugin: Plugin = {
     name: 'void:server-runtime-optimizer',
     configEnvironment(name) {
-      if (name !== 'client') {
+      if (name === 'client') {
+        return;
+      }
+      if (!voidOwnsWorkerRuntime) {
         return { optimizeDeps: { exclude: ['void'] } };
       }
+      return {
+        optimizeDeps: {
+          exclude: ['void'],
+          // Excluding void also skips converting its CommonJS dependencies, which workerd cannot
+          // evaluate: an installed void/email fails with "exports is not defined". Runtimes a
+          // framework owns stay untouched; Node loads CommonJS itself, and forcing an include
+          // there turns on SSR prebundling the framework did not ask for.
+          include: ['void > email-validator'],
+        },
+      };
     },
   };
 
diff --git a/packages/void/test/unit/plugin-dev-asset-routing.test.ts b/packages/void/test/unit/plugin-dev-asset-routing.test.ts
index f213f480c..6b7859fc7 100644
--- a/packages/void/test/unit/plugin-dev-asset-routing.test.ts
+++ b/packages/void/test/unit/plugin-dev-asset-routing.test.ts
@@ -72,6 +72,15 @@ function createFrameworkProjectRoot(): string {
   return root;
 }
 
+function createFrameworkOwnedRuntimeProjectRoot(): string {
+  const root = createProjectRoot();
+  writeFileSync(
+    join(root, 'package.json'),
+    JSON.stringify({ type: 'module', dependencies: { '@analogjs/platform': '^2.0.0' } }),
+  );
+  return root;
+}
+
 function createNodeProjectRoot(): string {
   const root = createProjectRoot();
   writeFileSync(
@@ -220,12 +229,19 @@ describe('voidPlugin dev asset routing', () => {
   });
 
   it('keeps one Void runtime module graph in core, framework, and Node servers', async () => {
+    const workerdOptimizer = {
+      optimizeDeps: { exclude: ['void'], include: ['void > email-validator'] },
+    };
     await expect(
       resolveRuntimeOptimizerConfig(createApiOnlyProjectRoot(), 'void_worker'),
-    ).resolves.toEqual({ optimizeDeps: { exclude: ['void'] } });
+    ).resolves.toEqual(workerdOptimizer);
     vi.restoreAllMocks();
     await expect(
       resolveRuntimeOptimizerConfig(createFrameworkProjectRoot(), 'ssr'),
+    ).resolves.toEqual(workerdOptimizer);
+    vi.restoreAllMocks();
+    await expect(
+      resolveRuntimeOptimizerConfig(createFrameworkOwnedRuntimeProjectRoot(), 'ssr'),
     ).resolves.toEqual({ optimizeDeps: { exclude: ['void'] } });
     vi.restoreAllMocks();
     await expect(resolveRuntimeOptimizerConfig(createNodeProjectRoot(), 'ssr')).resolves.toEqual({