diff --git a/backend/apps/web/routers/auths.py b/backend/apps/web/routers/auths.py
index fb113989..714982e3 100644
--- a/backend/apps/web/routers/auths.py
+++ b/backend/apps/web/routers/auths.py
@@ -8,6 +8,7 @@ from pydantic import BaseModel
 import time
 import uuid
 
+
 from apps.web.models.auths import (
     SigninForm,
     SignupForm,
@@ -20,7 +21,7 @@ from apps.web.models.users import Users
 
 
 from utils.utils import get_password_hash, get_current_user, create_token
-from utils.misc import get_gravatar_url
+from utils.misc import get_gravatar_url, validate_email_format
 from constants import ERROR_MESSAGES
 
 
@@ -95,33 +96,38 @@ async def signin(form_data: SigninForm):
 @router.post("/signup", response_model=SigninResponse)
 async def signup(request: Request, form_data: SignupForm):
     if request.app.state.ENABLE_SIGNUP:
-        if not Users.get_user_by_email(form_data.email.lower()):
-            try:
-                role = "admin" if Users.get_num_users() == 0 else "pending"
-                hashed = get_password_hash(form_data.password)
-                user = Auths.insert_new_auth(
-                    form_data.email.lower(), hashed, form_data.name, role
-                )
+        if validate_email_format(form_data.email.lower()):
+            if not Users.get_user_by_email(form_data.email.lower()):
+                try:
+                    role = "admin" if Users.get_num_users() == 0 else "pending"
+                    hashed = get_password_hash(form_data.password)
+                    user = Auths.insert_new_auth(
+                        form_data.email.lower(), hashed, form_data.name, role
+                    )
 
-                if user:
-                    token = create_token(data={"email": user.email})
-                    # response.set_cookie(key='token', value=token, httponly=True)
+                    if user:
+                        token = create_token(data={"email": user.email})
+                        # response.set_cookie(key='token', value=token, httponly=True)
 
-                    return {
-                        "token": token,
-                        "token_type": "Bearer",
-                        "id": user.id,
-                        "email": user.email,
-                        "name": user.name,
-                        "role": user.role,
-                        "profile_image_url": user.profile_image_url,
-                    }
-                else:
-                    raise HTTPException(500, detail=ERROR_MESSAGES.CREATE_USER_ERROR)
-            except Exception as err:
-                raise HTTPException(500, detail=ERROR_MESSAGES.DEFAULT(err))
+                        return {
+                            "token": token,
+                            "token_type": "Bearer",
+                            "id": user.id,
+                            "email": user.email,
+                            "name": user.name,
+                            "role": user.role,
+                            "profile_image_url": user.profile_image_url,
+                        }
+                    else:
+                        raise HTTPException(
+                            500, detail=ERROR_MESSAGES.CREATE_USER_ERROR
+                        )
+                except Exception as err:
+                    raise HTTPException(500, detail=ERROR_MESSAGES.DEFAULT(err))
+            else:
+                raise HTTPException(400, detail=ERROR_MESSAGES.EMAIL_TAKEN)
         else:
-            raise HTTPException(400, detail=ERROR_MESSAGES.EMAIL_TAKEN)
+            raise HTTPException(400, detail=ERROR_MESSAGES.INVALID_EMAIL_FORMAT)
     else:
         raise HTTPException(400, detail=ERROR_MESSAGES.ACCESS_PROHIBITED)
 
diff --git a/backend/constants.py b/backend/constants.py
index 761507f2..ec3ce337 100644
--- a/backend/constants.py
+++ b/backend/constants.py
@@ -21,6 +21,7 @@ class ERROR_MESSAGES(str, Enum):
         "Your session has expired or the token is invalid. Please sign in again."
     )
     INVALID_CRED = "The email or password provided is incorrect. Please check for typos and try logging in again."
+    INVALID_EMAIL_FORMAT = "The email format you entered is invalid. Please double-check and make sure you're using a valid email address (e.g., yourname@example.com)."
     INVALID_PASSWORD = (
         "The password provided is incorrect. Please check for typos and try again."
     )
diff --git a/backend/utils/misc.py b/backend/utils/misc.py
index c6508487..5635c57a 100644
--- a/backend/utils/misc.py
+++ b/backend/utils/misc.py
@@ -1,4 +1,5 @@
 import hashlib
+import re
 
 
 def get_gravatar_url(email):
@@ -21,3 +22,9 @@ def calculate_sha256(file):
     for chunk in iter(lambda: file.read(8192), b""):
         sha256.update(chunk)
     return sha256.hexdigest()
+
+
+def validate_email_format(email: str) -> bool:
+    if not re.match(r"[^@]+@[^@]+\.[^@]+", email):
+        return False
+    return True