.gitignore

@@ -25,6 +25,7 @@ pnpm-debug.log*
 /generated/prisma
 prisma/*.db
 prisma/dev.db
+data/
 
 # opencode - agentes y scripts locales (no subir a producción)
 opencode/

src/pages/api/formulario/send.ts

@@ -1,6 +1,7 @@
 import type { APIRoute } from "astro";
 import { appendRegistrationToSheet } from "../lib/googleSheets";
 import { sendEmailCf } from "../lib/email";
+import { emailExistsInRegistry, addEmailToRegistry } from "../lib/emailsRegistry";
 export const prerender = false;
 
 const COLUMNS = [
@@ -101,6 +102,13 @@ export const POST: APIRoute = async ({ request }) => {
       timeZone: "America/Puerto_Rico",
     });
 
+    if (emailExistsInRegistry(formData.correo)) {
+      return Response.json(
+        { success: false, message: "Este correo ya está registrado. No se permiten 2 registros." },
+        { status: 409 }
+      );
+    }
+
     const row = COLUMNS.map((key) => flattenValue(formData[key]));
     row.push(timestamp);
 
@@ -111,6 +119,8 @@ export const POST: APIRoute = async ({ request }) => {
       apellidos: formData.apellido,
     }, formData.correo, "CENTRO_DEL_REINO_PAZ_Y_JUSTICIA_POSTULACION");
 
+    addEmailToRegistry(formData.correo);
+
     return Response.json(result);
   } catch (error) {
     console.error("Error en /api/formulario/send:", error);

src/pages/api/lib/email.ts

@@ -96,7 +96,7 @@ export async function sendEmailCf(data: Record<string, string>, to: string, type
       text,
     });
 
-    if (response.permanent_bounces.includes(to)) {
+    if (!response.delivered.includes(to)) {
       console.error("Cloudflare email not delivered", response);
       throw new Error("El correo no fue entregado");
     }

src/pages/api/lib/emailsRegistry.ts

@@ -0,0 +1,22 @@
+import fs from "node:fs";
+import path from "node:path";
+
+const REGISTRY_PATH = path.resolve(process.cwd(), "data", "emails.txt");
+
+export function emailExistsInRegistry(email: string): boolean {
+  try {
+    if (!fs.existsSync(REGISTRY_PATH)) return false;
+    const content = fs.readFileSync(REGISTRY_PATH, "utf-8");
+    return content.split("\n").some((line) => line.trim().toLowerCase() === email.trim().toLowerCase());
+  } catch {
+    return false;
+  }
+}
+
+export function addEmailToRegistry(email: string): void {
+  const dir = path.dirname(REGISTRY_PATH);
+  if (!fs.existsSync(dir)) {
+    fs.mkdirSync(dir, { recursive: true });
+  }
+  fs.appendFileSync(REGISTRY_PATH, email.trim().toLowerCase() + "\n");
+}