diff --git a/src/pages/api/contact.ts b/src/pages/api/contact.ts
index 66b4e75..8b7ce17 100644
--- a/src/pages/api/contact.ts
+++ b/src/pages/api/contact.ts
@@ -115,8 +115,12 @@ export const POST: APIRoute = async ({ request, url }) => {
   try {
     const runtimeEnv = getRuntimeEnv();
     const mode = readEnv('CONTACT_FORM_MODE', runtimeEnv).toLowerCase() || 'dev';
-    const fromEmail = readEnv('CONTACT_FORM_FROM_EMAIL', runtimeEnv);
-    const toEmail = readEnv('CONTACT_FORM_TO_EMAIL', runtimeEnv);
+    const fromEmail =
+      readEnv('CONTACT_FORM_FROM_EMAIL', runtimeEnv) ||
+      readEnv('NEWSLETTER_FROM_EMAIL', runtimeEnv);
+    const toEmail =
+      readEnv('CONTACT_FORM_TO_EMAIL', runtimeEnv) ||
+      readEnv('NEWSLETTER_NOTIFY_TO_EMAIL', runtimeEnv);
     const turnstileSecret = readEnv('CONTACT_TURNSTILE_SECRET_KEY', runtimeEnv);
 
     const form = await request.formData();
@@ -173,9 +177,14 @@ export const POST: APIRoute = async ({ request, url }) => {
     if (mode === 'live') {
       const emailBinding = getEmailBinding(runtimeEnv);
       if (!emailBinding || !fromEmail || !toEmail) {
+        const missing = [
+          !emailBinding ? 'EMAIL binding' : '',
+          !fromEmail ? 'CONTACT_FORM_FROM_EMAIL (o NEWSLETTER_FROM_EMAIL)' : '',
+          !toEmail ? 'CONTACT_FORM_TO_EMAIL (o NEWSLETTER_NOTIFY_TO_EMAIL)' : '',
+        ].filter(Boolean);
         return fail(
           request,
-          'Live mode requires EMAIL binding (Cloudflare Email Service), CONTACT_FORM_FROM_EMAIL and CONTACT_FORM_TO_EMAIL.',
+          `Config email incompleta: manca ${missing.join(', ')}. Imposta le variabili runtime del Worker (Settings → Variables and Secrets), non Build.`,
           500,
         );
       }