diff --git a/api/server/services/AuthService.js b/api/server/services/AuthService.js
index 8f6c281ee1..a4a59bb8b6 100644
--- a/api/server/services/AuthService.js
+++ b/api/server/services/AuthService.js
@@ -218,16 +218,17 @@ const createTokenHash = () => {
  */
 const sendVerificationEmail = async (user) => {
   const [verifyToken, hash] = createTokenHash();
+  const email = user.email.toLowerCase();
 
   const verificationLink = `${
     domains.client
-  }/verify?token=${verifyToken}&email=${encodeURIComponent(user.email)}`;
+  }/verify?token=${verifyToken}&email=${encodeURIComponent(email)}`;
   await sendEmail({
-    email: user.email,
+    email,
     subject: 'Verify your email',
     payload: {
       appName: process.env.APP_TITLE || 'LibreChat',
-      name: user.name || user.username || user.email,
+      name: user.name || user.username || email,
       verificationLink: verificationLink,
       year: new Date().getFullYear(),
     },
@@ -236,14 +237,14 @@ const sendVerificationEmail = async (user) => {
 
   await createToken({
     userId: user._id,
-    email: user.email,
+    email,
     type: AuthTokenTypes.EMAIL_VERIFICATION,
     token: hash,
     createdAt: Date.now(),
     expiresIn: 900,
   });
 
-  logger.info(`[sendVerificationEmail] Verification link issued. [Email: ${user.email}]`);
+  logger.info(`[sendVerificationEmail] Verification link issued. [Email: ${email}]`);
 };
 
 /**
diff --git a/api/server/services/AuthService.spec.js b/api/server/services/AuthService.spec.js
index 03579e7278..ce4dd517ff 100644
--- a/api/server/services/AuthService.spec.js
+++ b/api/server/services/AuthService.spec.js
@@ -471,6 +471,31 @@ describe('registerUser', () => {
       }),
     );
   });
+
+  it('normalizes mixed-case emails when issuing the verification token and link', async () => {
+    checkEmailConfig.mockReturnValue(true);
+
+    const result = await registerUser({
+      ...registrationPayload,
+      email: 'Mixed.Case@Example.com',
+    });
+
+    expect(result.status).toBe(200);
+    expect(createToken).toHaveBeenCalledWith(
+      expect.objectContaining({
+        email: 'mixed.case@example.com',
+        type: 'email_verification',
+      }),
+    );
+    expect(sendEmail).toHaveBeenCalledWith(
+      expect.objectContaining({
+        email: 'mixed.case@example.com',
+        payload: expect.objectContaining({
+          verificationLink: expect.stringContaining(encodeURIComponent('mixed.case@example.com')),
+        }),
+      }),
+    );
+  });
 });
 
 describe('verifyEmail public response handling', () => {