diff --git a/web-next/app/[locale]/my-account/page.tsx b/web-next/app/[locale]/my-account/page.tsx
index 9b5be78..28abe7a 100644
--- a/web-next/app/[locale]/my-account/page.tsx
+++ b/web-next/app/[locale]/my-account/page.tsx
@@ -2,6 +2,7 @@ import { getTranslations, setRequestLocale } from 'next-intl/server'
 import { redirect, Link } from '@/i18n/navigation'
 import { getSession } from '@/lib/session'
 import { getRealmName, realmSlug } from '@/lib/realm'
+import { gameAccountDisplayName } from '@/lib/bnet'
 import { getAccountDashboard, getAccountRank } from '@/lib/account'
 import { reconcileSumUpCheckouts } from '@/lib/sumup'
 import { getGameAccounts } from '@/lib/auth'
@@ -22,13 +23,6 @@ function maskEmail(e: string): string {
   return `${visible}***@${domain}`
 }
 
-// Nombre visible de la cuenta de juego: «15#1» → «WOW1» (el nº tras # es la
-// cuenta de juego; con varias serían WOW1, WOW2, WOW3…).
-function wowAccountName(username: string): string {
-  const i = username.indexOf('#')
-  return i >= 0 ? `WOW${username.slice(i + 1)}` : username
-}
-
 const ICONS = '/ns-themes/ns-ryu/ns-images/ns-icons'
 
 export default async function AccountPage({ params }: { params: Promise<{ locale: string }> }) {
@@ -67,7 +61,7 @@ export default async function AccountPage({ params }: { params: Promise<{ locale
                 <GameAccountSwitcher
                   accounts={games}
                   currentId={session.accountId ?? 0}
-                  currentLabel={wowAccountName(data.gameAccount)}
+                  currentLabel={gameAccountDisplayName(data.gameAccount)}
                 />
               </p>
               <p><i className="fa-solid fa-at account-ficon third-brown"></i> {t('regMail')}: <span>{maskEmail(data.regMail)}</span></p>
diff --git a/web-next/lib/bnet.ts b/web-next/lib/bnet.ts
index 1f90539..802e187 100644
--- a/web-next/lib/bnet.ts
+++ b/web-next/lib/bnet.ts
@@ -147,6 +147,24 @@ export function makeGameAccountUsername(bnetId: number, index = 1): string {
   return `${bnetId}#${index}`
 }
 
+/**
+ * Inverso de `makeGameAccountUsername` para enseñárselo al usuario: «15#1» → «WOW1».
+ * El número tras # es la cuenta de juego (WOW1…WOW8). El `15#1` es interno y no le
+ * dice nada a nadie.
+ */
+export function gameAccountDisplayName(username: string): string {
+  const i = username.indexOf('#')
+  return i >= 0 ? `WOW${username.slice(i + 1)}` : username
+}
+
+/**
+ * Solo se admiten cuentas de Gmail. Lleva la `i` a propósito: sin ella
+ * `NOVAWOW86@GMAIL.COM` se rechazaba, y es justo como sale el correo en los
+ * mensajes que enviamos, así que quien lo copiara de ahí no podía ni registrarse
+ * ni recuperar la cuenta. El dominio del correo NO distingue mayúsculas.
+ */
+export const GMAIL_RE = /^[a-zA-Z0-9._%+-]+@gmail\.com$/i
+
 /**
  * Cuentas de juego por cuenta Battle.net (WoW1…WoW8). Vive aquí, y no en la ruta
  * que la aplica, para que el correo de activación cite el límite REAL: el texto
diff --git a/web-next/lib/change-email.ts b/web-next/lib/change-email.ts
index 5268684..c39d30c 100644
--- a/web-next/lib/change-email.ts
+++ b/web-next/lib/change-email.ts
@@ -2,13 +2,12 @@ import crypto from 'node:crypto'
 import type { RowDataPacket, ResultSetHeader } from 'mysql2'
 import { db, DB } from './db'
 import { authenticate } from './auth'
-import { bnetMakeRegistration, normalizeEmail } from './bnet'
+import { bnetMakeRegistration, normalizeEmail, GMAIL_RE } from './bnet'
 import { checkSecurityToken } from './security-token'
 import { sendMail } from './mail'
 import { confirmNewEmailHtml, confirmOldEmailHtml } from './emails'
 import type { SessionData } from './session'
 
-const GMAIL_RE = /^[a-zA-Z0-9._%+-]+@gmail\.com$/
 
 export interface Result {
   success: boolean
diff --git a/web-next/lib/emails.ts b/web-next/lib/emails.ts
index 01c453c..ea4ef43 100644
--- a/web-next/lib/emails.ts
+++ b/web-next/lib/emails.ts
@@ -21,7 +21,7 @@
  * entra con el correo, no con un usuario).
  */
 
-import { MAX_GAME_ACCOUNTS } from './bnet'
+import { MAX_GAME_ACCOUNTS, gameAccountDisplayName } from './bnet'
 
 const SERVER_NAME = 'NightSpire'
 
@@ -275,9 +275,10 @@ export function passwordResetEmailHtml(email: string, link: string, locale = 'es
 }
 
 /** `account_names.html` — recordatorio de cuentas de juego. */
+/** `accounts` son los usernames internos («17#1»); aquí se muestran como «WOW1». */
 export function accountNamesEmailHtml(email: string, accounts: string[], locale = 'es'): string {
   const list = accounts.length
-    ? pData(accounts.map((a) => `Cuenta: ${esc(a)}`).join('<br>') + '<br><br>')
+    ? pData(accounts.map((a) => `Cuenta: ${esc(gameAccountDisplayName(a))}`).join('<br>') + '<br><br>')
     : pData('No hay cuentas de juego asociadas todavía.<br><br>')
   return layout('CUENTAS DE JUEGO', 'Tus Cuentas de Juego', [
     p(
@@ -343,7 +344,9 @@ export function securityTokensListEmailHtml(
     [
       p(`Estos son los Token de seguridad de las cuentas de juego asociadas a ${esc(email)}.<br><br>Tus datos de cuenta son:`),
       pData(
-        items.map((i) => `Cuenta: ${esc(i.username)}<br>Token de Seguridad: ${esc(i.token)}`).join('<br><br>') +
+        items
+          .map((i) => `Cuenta: ${esc(gameAccountDisplayName(i.username))}<br>Token de Seguridad: ${esc(i.token)}`)
+          .join('<br><br>') +
           '<br><br>',
       ),
       p(
diff --git a/web-next/lib/recover.ts b/web-next/lib/recover.ts
index 19ef89b..32e8c97 100644
--- a/web-next/lib/recover.ts
+++ b/web-next/lib/recover.ts
@@ -1,7 +1,7 @@
 import crypto from 'node:crypto'
 import type { RowDataPacket } from 'mysql2'
 import { db, DB } from './db'
-import { normalizeEmail, bnetMakeRegistration } from './bnet'
+import { normalizeEmail, bnetMakeRegistration, GMAIL_RE } from './bnet'
 import { sendMail } from './mail'
 import {
   activationEmailHtml,
@@ -10,7 +10,6 @@ import {
   securityTokensListEmailHtml,
 } from './emails'
 
-const GMAIL_RE = /^[a-zA-Z0-9._%+-]+@gmail\.com$/
 
 export interface Result {
   success: boolean
diff --git a/web-next/lib/register.ts b/web-next/lib/register.ts
index ca81e5f..ae1d12b 100644
--- a/web-next/lib/register.ts
+++ b/web-next/lib/register.ts
@@ -1,11 +1,10 @@
 import type { ResultSetHeader, RowDataPacket } from 'mysql2'
 import { db, DB } from './db'
-import { normalizeEmail, bnetMakeRegistration, gameMakeRegistration, makeGameAccountUsername } from './bnet'
+import { normalizeEmail, bnetMakeRegistration, gameMakeRegistration, makeGameAccountUsername, GMAIL_RE } from './bnet'
 import { sendMail } from './mail'
 import { activationEmailHtml } from './emails'
 import { randomToken } from './random-token'
 
-const GMAIL_RE = /^[a-zA-Z0-9._%+-]+@gmail\.com$/
 
 export interface RegisterInput {
   password: string