diff --git a/api/server/middleware/checkDomainAllowed.js b/api/server/middleware/checkDomainAllowed.js
index 914ac44da5..754eb9c127 100644
--- a/api/server/middleware/checkDomainAllowed.js
+++ b/api/server/middleware/checkDomainAllowed.js
@@ -1,5 +1,5 @@
 const { logger } = require('@librechat/data-schemas');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
+const { isEmailDomainAllowed } = require('@librechat/api');
 const { getAppConfig } = require('~/server/services/Config');
 
 /**
diff --git a/api/server/routes/agents/actions.js b/api/server/routes/agents/actions.js
index 2a0629235d..aceaa8d207 100644
--- a/api/server/routes/agents/actions.js
+++ b/api/server/routes/agents/actions.js
@@ -1,20 +1,19 @@
 const express = require('express');
 const { nanoid } = require('nanoid');
 const { logger } = require('@librechat/data-schemas');
-const { generateCheckAccess } = require('@librechat/api');
+const { generateCheckAccess, isActionDomainAllowed } = require('@librechat/api');
 const {
   Permissions,
   ResourceType,
+  PermissionBits,
   PermissionTypes,
   actionDelimiter,
-  PermissionBits,
   removeNullishValues,
 } = require('librechat-data-provider');
 const { encryptMetadata, domainParser } = require('~/server/services/ActionService');
 const { findAccessibleResources } = require('~/server/services/PermissionService');
 const { getAgent, updateAgent, getListAgentsByAccess } = require('~/models/Agent');
 const { updateAction, getActions, deleteAction } = require('~/models/Action');
-const { isActionDomainAllowed } = require('~/server/services/domains');
 const { canAccessAgentResource } = require('~/server/middleware');
 const { getRoleByName } = require('~/models/Role');
 
diff --git a/api/server/routes/assistants/actions.js b/api/server/routes/assistants/actions.js
index 1853b5c109..3a1a844926 100644
--- a/api/server/routes/assistants/actions.js
+++ b/api/server/routes/assistants/actions.js
@@ -1,12 +1,12 @@
 const express = require('express');
 const { nanoid } = require('nanoid');
 const { logger } = require('@librechat/data-schemas');
+const { isActionDomainAllowed } = require('@librechat/api');
 const { actionDelimiter, EModelEndpoint, removeNullishValues } = require('librechat-data-provider');
 const { encryptMetadata, domainParser } = require('~/server/services/ActionService');
 const { getOpenAIClient } = require('~/server/controllers/assistants/helpers');
 const { updateAction, getActions, deleteAction } = require('~/models/Action');
 const { updateAssistantDoc, getAssistant } = require('~/models/Assistant');
-const { isActionDomainAllowed } = require('~/server/services/domains');
 
 const router = express.Router();
 
diff --git a/api/server/services/AuthService.js b/api/server/services/AuthService.js
index 2ca9aa56b8..1792de66db 100644
--- a/api/server/services/AuthService.js
+++ b/api/server/services/AuthService.js
@@ -2,7 +2,7 @@ const bcrypt = require('bcryptjs');
 const jwt = require('jsonwebtoken');
 const { webcrypto } = require('node:crypto');
 const { logger } = require('@librechat/data-schemas');
-const { isEnabled, checkEmailConfig } = require('@librechat/api');
+const { isEnabled, checkEmailConfig, isEmailDomainAllowed } = require('@librechat/api');
 const { ErrorTypes, SystemRoles, errorsToString } = require('librechat-data-provider');
 const {
   findUser,
@@ -20,7 +20,6 @@ const {
   deleteUserById,
   generateRefreshToken,
 } = require('~/models');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
 const { registerSchema } = require('~/strategies/validators');
 const { getAppConfig } = require('~/server/services/Config');
 const { sendEmail } = require('~/server/utils');
diff --git a/api/server/services/ToolService.js b/api/server/services/ToolService.js
index 5245b43221..4b9708861c 100644
--- a/api/server/services/ToolService.js
+++ b/api/server/services/ToolService.js
@@ -1,7 +1,12 @@
 const { sleep } = require('@librechat/agents');
 const { logger } = require('@librechat/data-schemas');
 const { tool: toolFn, DynamicStructuredTool } = require('@langchain/core/tools');
-const { getToolkitKey, hasCustomUserVars, getUserMCPAuthMap } = require('@librechat/api');
+const {
+  getToolkitKey,
+  hasCustomUserVars,
+  getUserMCPAuthMap,
+  isActionDomainAllowed,
+} = require('@librechat/api');
 const {
   Tools,
   Constants,
@@ -26,7 +31,6 @@ const { processFileURL, uploadImageBuffer } = require('~/server/services/Files/p
 const { getEndpointsConfig, getCachedTools } = require('~/server/services/Config');
 const { manifestToolMap, toolkits } = require('~/app/clients/tools/manifest');
 const { createOnSearchResults } = require('~/server/services/Tools/search');
-const { isActionDomainAllowed } = require('~/server/services/domains');
 const { recordUsage } = require('~/server/services/Threads');
 const { loadTools } = require('~/app/clients/tools/util');
 const { redactMessage } = require('~/config/parsers');
diff --git a/api/strategies/ldapStrategy.js b/api/strategies/ldapStrategy.js
index 17d54df4a9..dcadc26a45 100644
--- a/api/strategies/ldapStrategy.js
+++ b/api/strategies/ldapStrategy.js
@@ -1,10 +1,9 @@
 const fs = require('fs');
 const LdapStrategy = require('passport-ldapauth');
 const { logger } = require('@librechat/data-schemas');
-const { isEnabled, getBalanceConfig } = require('@librechat/api');
 const { SystemRoles, ErrorTypes } = require('librechat-data-provider');
+const { isEnabled, getBalanceConfig, isEmailDomainAllowed } = require('@librechat/api');
 const { createUser, findUser, updateUser, countUsers } = require('~/models');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
 const { getAppConfig } = require('~/server/services/Config');
 
 const {
diff --git a/api/strategies/ldapStrategy.spec.js b/api/strategies/ldapStrategy.spec.js
index d3d51a4cda..a00e9b14b7 100644
--- a/api/strategies/ldapStrategy.spec.js
+++ b/api/strategies/ldapStrategy.spec.js
@@ -11,6 +11,7 @@ jest.mock('@librechat/data-schemas', () => ({
 jest.mock('@librechat/api', () => ({
   // isEnabled used for TLS flags
   isEnabled: jest.fn(() => false),
+  isEmailDomainAllowed: jest.fn(() => true),
   getBalanceConfig: jest.fn(() => ({ enabled: false })),
 }));
 
@@ -25,10 +26,6 @@ jest.mock('~/server/services/Config', () => ({
   getAppConfig: jest.fn().mockResolvedValue({}),
 }));
 
-jest.mock('~/server/services/domains', () => ({
-  isEmailDomainAllowed: jest.fn(() => true),
-}));
-
 // Mock passport-ldapauth to capture verify callback
 let verifyCallback;
 jest.mock('passport-ldapauth', () => {
@@ -39,8 +36,8 @@ jest.mock('passport-ldapauth', () => {
 });
 
 const { ErrorTypes } = require('librechat-data-provider');
+const { isEmailDomainAllowed } = require('@librechat/api');
 const { findUser, createUser, updateUser, countUsers } = require('~/models');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
 
 // Helper to call the verify callback and wrap in a Promise for convenience
 const callVerify = (userinfo) =>
diff --git a/api/strategies/openidStrategy.js b/api/strategies/openidStrategy.js
index 0a396211cf..ce564fc655 100644
--- a/api/strategies/openidStrategy.js
+++ b/api/strategies/openidStrategy.js
@@ -13,9 +13,9 @@ const {
   safeStringify,
   findOpenIDUser,
   getBalanceConfig,
+  isEmailDomainAllowed,
 } = require('@librechat/api');
 const { getStrategyFunctions } = require('~/server/services/Files/strategies');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
 const { findUser, createUser, updateUser } = require('~/models');
 const { getAppConfig } = require('~/server/services/Config');
 const getLogStores = require('~/cache/getLogStores');
diff --git a/api/strategies/samlStrategy.js b/api/strategies/samlStrategy.js
index a5f2e1d0bd..843baf8a64 100644
--- a/api/strategies/samlStrategy.js
+++ b/api/strategies/samlStrategy.js
@@ -2,12 +2,11 @@ const fs = require('fs');
 const path = require('path');
 const fetch = require('node-fetch');
 const passport = require('passport');
-const { getBalanceConfig } = require('@librechat/api');
 const { ErrorTypes } = require('librechat-data-provider');
 const { hashToken, logger } = require('@librechat/data-schemas');
 const { Strategy: SamlStrategy } = require('@node-saml/passport-saml');
+const { getBalanceConfig, isEmailDomainAllowed } = require('@librechat/api');
 const { getStrategyFunctions } = require('~/server/services/Files/strategies');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
 const { findUser, createUser, updateUser } = require('~/models');
 const { getAppConfig } = require('~/server/services/Config');
 const paths = require('~/config/paths');
diff --git a/api/strategies/samlStrategy.spec.js b/api/strategies/samlStrategy.spec.js
index 812c24f26f..06c969ce46 100644
--- a/api/strategies/samlStrategy.spec.js
+++ b/api/strategies/samlStrategy.spec.js
@@ -26,6 +26,7 @@ jest.mock('~/server/services/Config', () => ({
   getAppConfig: jest.fn().mockResolvedValue({}),
 }));
 jest.mock('@librechat/api', () => ({
+  isEmailDomainAllowed: jest.fn(() => true),
   getBalanceConfig: jest.fn(() => ({
     tokenCredits: 1000,
     startBalance: 1000,
diff --git a/api/strategies/socialLogin.js b/api/strategies/socialLogin.js
index 5f7fab01c4..bad70cc040 100644
--- a/api/strategies/socialLogin.js
+++ b/api/strategies/socialLogin.js
@@ -1,8 +1,7 @@
-const { isEnabled } = require('@librechat/api');
 const { logger } = require('@librechat/data-schemas');
 const { ErrorTypes } = require('librechat-data-provider');
+const { isEnabled, isEmailDomainAllowed } = require('@librechat/api');
 const { createSocialUser, handleExistingUser } = require('./process');
-const { isEmailDomainAllowed } = require('~/server/services/domains');
 const { getAppConfig } = require('~/server/services/Config');
 const { findUser } = require('~/models');
 
diff --git a/api/server/services/domains.spec.js b/packages/api/src/auth/domain.spec.ts
similarity index 73%
rename from api/server/services/domains.spec.js
rename to packages/api/src/auth/domain.spec.ts
index a640628462..c84d32cbcd 100644
--- a/api/server/services/domains.spec.js
+++ b/packages/api/src/auth/domain.spec.ts
@@ -1,9 +1,5 @@
-const { isEmailDomainAllowed, isActionDomainAllowed } = require('~/server/services/domains');
-const { getAppConfig } = require('~/server/services/Config');
-
-jest.mock('~/server/services/Config', () => ({
-  getAppConfig: jest.fn(),
-}));
+/* eslint-disable @typescript-eslint/ban-ts-comment */
+import { isEmailDomainAllowed, isActionDomainAllowed } from './domain';
 
 describe('isEmailDomainAllowed', () => {
   afterEach(() => {
@@ -24,39 +20,72 @@ describe('isEmailDomainAllowed', () => {
 
   it('should return true if customConfig is not available', async () => {
     const email = 'test@domain1.com';
-    getAppConfig.mockResolvedValue(null);
     const result = isEmailDomainAllowed(email, null);
     expect(result).toBe(true);
   });
 
   it('should return true if allowedDomains is not defined in customConfig', async () => {
     const email = 'test@domain1.com';
-    getAppConfig.mockResolvedValue({});
     const result = isEmailDomainAllowed(email, undefined);
     expect(result).toBe(true);
   });
 
   it('should return true if domain is included in the allowedDomains', async () => {
     const email = 'user@domain1.com';
-    getAppConfig.mockResolvedValue({
-      registration: {
-        allowedDomains: ['domain1.com', 'domain2.com'],
-      },
-    });
     const result = isEmailDomainAllowed(email, ['domain1.com', 'domain2.com']);
     expect(result).toBe(true);
   });
 
   it('should return false if domain is not included in the allowedDomains', async () => {
     const email = 'user@domain3.com';
-    getAppConfig.mockResolvedValue({
-      registration: {
-        allowedDomains: ['domain1.com', 'domain2.com'],
-      },
-    });
     const result = isEmailDomainAllowed(email, ['domain1.com', 'domain2.com']);
     expect(result).toBe(false);
   });
+
+  describe('case-insensitive domain matching', () => {
+    it('should match domains case-insensitively when email has uppercase domain', () => {
+      const email = 'user@DOMAIN1.COM';
+      const result = isEmailDomainAllowed(email, ['domain1.com', 'domain2.com']);
+      expect(result).toBe(true);
+    });
+
+    it('should match domains case-insensitively when allowedDomains has uppercase', () => {
+      const email = 'user@domain1.com';
+      const result = isEmailDomainAllowed(email, ['DOMAIN1.COM', 'DOMAIN2.COM']);
+      expect(result).toBe(true);
+    });
+
+    it('should match domains with mixed case in email', () => {
+      const email = 'user@Example.Com';
+      const result = isEmailDomainAllowed(email, ['example.com', 'domain2.com']);
+      expect(result).toBe(true);
+    });
+
+    it('should match domains with mixed case in allowedDomains', () => {
+      const email = 'user@example.com';
+      const result = isEmailDomainAllowed(email, ['Example.Com', 'Domain2.Com']);
+      expect(result).toBe(true);
+    });
+
+    it('should match when both email and allowedDomains have different mixed cases', () => {
+      const email = 'user@ExAmPlE.cOm';
+      const result = isEmailDomainAllowed(email, ['eXaMpLe.CoM', 'domain2.com']);
+      expect(result).toBe(true);
+    });
+
+    it('should still return false for non-matching domains regardless of case', () => {
+      const email = 'user@DOMAIN3.COM';
+      const result = isEmailDomainAllowed(email, ['domain1.com', 'DOMAIN2.COM']);
+      expect(result).toBe(false);
+    });
+
+    it('should handle null/undefined entries in allowedDomains gracefully', () => {
+      const email = 'user@domain1.com';
+      // @ts-expect-error Testing invalid input
+      const result = isEmailDomainAllowed(email, [null, 'DOMAIN1.COM', undefined]);
+      expect(result).toBe(true);
+    });
+  });
 });
 
 describe('isActionDomainAllowed', () => {
@@ -74,15 +103,15 @@ describe('isActionDomainAllowed', () => {
     });
 
     it('should return false for non-string inputs', async () => {
+      /** @ts-expect-error */
       expect(await isActionDomainAllowed(123)).toBe(false);
+      /** @ts-expect-error */
       expect(await isActionDomainAllowed({})).toBe(false);
+      /** @ts-expect-error */
       expect(await isActionDomainAllowed([])).toBe(false);
     });
 
     it('should return false for invalid domain formats', async () => {
-      getAppConfig.mockResolvedValue({
-        actions: { allowedDomains: ['http://', 'https://'] },
-      });
       expect(await isActionDomainAllowed('http://', ['http://', 'https://'])).toBe(false);
       expect(await isActionDomainAllowed('https://', ['http://', 'https://'])).toBe(false);
     });
@@ -91,19 +120,14 @@ describe('isActionDomainAllowed', () => {
   // Configuration Tests
   describe('configuration handling', () => {
     it('should return true if customConfig is null', async () => {
-      getAppConfig.mockResolvedValue(null);
       expect(await isActionDomainAllowed('example.com', null)).toBe(true);
     });
 
     it('should return true if actions.allowedDomains is not defined', async () => {
-      getAppConfig.mockResolvedValue({});
       expect(await isActionDomainAllowed('example.com', undefined)).toBe(true);
     });
 
     it('should return true if allowedDomains is empty array', async () => {
-      getAppConfig.mockResolvedValue({
-        actions: { allowedDomains: [] },
-      });
       expect(await isActionDomainAllowed('example.com', [])).toBe(true);
     });
   });
@@ -118,14 +142,6 @@ describe('isActionDomainAllowed', () => {
       'swapi.dev',
     ];
 
-    beforeEach(() => {
-      getAppConfig.mockResolvedValue({
-        actions: {
-          allowedDomains,
-        },
-      });
-    });
-
     it('should match exact domains', async () => {
       expect(await isActionDomainAllowed('example.com', allowedDomains)).toBe(true);
       expect(await isActionDomainAllowed('other.com', allowedDomains)).toBe(false);
@@ -159,14 +175,6 @@ describe('isActionDomainAllowed', () => {
   describe('edge cases', () => {
     const edgeAllowedDomains = ['example.com', '*.test.com'];
 
-    beforeEach(() => {
-      getAppConfig.mockResolvedValue({
-        actions: {
-          allowedDomains: edgeAllowedDomains,
-        },
-      });
-    });
-
     it('should handle domains with query parameters', async () => {
       expect(await isActionDomainAllowed('example.com?param=value', edgeAllowedDomains)).toBe(true);
     });
@@ -186,12 +194,9 @@ describe('isActionDomainAllowed', () => {
 
     it('should handle invalid entries in allowedDomains', async () => {
       const invalidAllowedDomains = ['example.com', null, undefined, '', 'test.com'];
-      getAppConfig.mockResolvedValue({
-        actions: {
-          allowedDomains: invalidAllowedDomains,
-        },
-      });
+      /** @ts-expect-error */
       expect(await isActionDomainAllowed('example.com', invalidAllowedDomains)).toBe(true);
+      /** @ts-expect-error */
       expect(await isActionDomainAllowed('test.com', invalidAllowedDomains)).toBe(true);
     });
   });
diff --git a/api/server/services/domains.js b/packages/api/src/auth/domain.ts
similarity index 76%
rename from api/server/services/domains.js
rename to packages/api/src/auth/domain.ts
index 67966eeaac..06710ac6d7 100644
--- a/api/server/services/domains.js
+++ b/packages/api/src/auth/domain.ts
@@ -1,14 +1,13 @@
 /**
- * @param {string} email
- * @param {string[]} [allowedDomains]
- * @returns {boolean}
+ * @param email
+ * @param allowedDomains
  */
-function isEmailDomainAllowed(email, allowedDomains) {
+export function isEmailDomainAllowed(email: string, allowedDomains?: string[] | null): boolean {
   if (!email) {
     return false;
   }
 
-  const domain = email.split('@')[1];
+  const domain = email.split('@')[1]?.toLowerCase();
 
   if (!domain) {
     return false;
@@ -20,21 +19,15 @@ function isEmailDomainAllowed(email, allowedDomains) {
     return true;
   }
 
-  return allowedDomains.includes(domain);
+  return allowedDomains.some((allowedDomain) => allowedDomain?.toLowerCase() === domain);
 }
 
-/**
- * Normalizes a domain string
- * @param {string} domain
- * @returns {string|null}
- */
 /**
  * Normalizes a domain string. If the domain is invalid, returns null.
  * Normalized === lowercase, trimmed, and protocol added if missing.
- * @param {string} domain
- * @returns {string|null}
+ * @param domain
  */
-function normalizeDomain(domain) {
+function normalizeDomain(domain: string): string | null {
   try {
     let normalizedDomain = domain.toLowerCase().trim();
 
@@ -62,11 +55,13 @@ function normalizeDomain(domain) {
 
 /**
  * Checks if the given domain is allowed. If no restrictions are set, allows all domains.
- * @param {string} [domain]
- * @param {string[]} [allowedDomains]
- * @returns {Promise<boolean>}
+ * @param domain
+ * @param allowedDomains
  */
-async function isActionDomainAllowed(domain, allowedDomains) {
+export async function isActionDomainAllowed(
+  domain?: string | null,
+  allowedDomains?: string[] | null,
+): Promise<boolean> {
   if (!domain || typeof domain !== 'string') {
     return false;
   }
@@ -101,5 +96,3 @@ async function isActionDomainAllowed(domain, allowedDomains) {
 
   return false;
 }
-
-module.exports = { isEmailDomainAllowed, isActionDomainAllowed };
diff --git a/packages/api/src/auth/index.ts b/packages/api/src/auth/index.ts
index a5fb25405a..bee8cf1691 100644
--- a/packages/api/src/auth/index.ts
+++ b/packages/api/src/auth/index.ts
@@ -1 +1,2 @@
+export * from './domain';
 export * from './openid';