diff --git a/tabpfn_client/client.py b/tabpfn_client/client.py
index bb8a9eb..9730c84 100644
--- a/tabpfn_client/client.py
+++ b/tabpfn_client/client.py
@@ -397,6 +397,17 @@ def retrieve_greeting_messages(self) -> list[str]:
 
         greeting_messages = response.json()["messages"]
         return greeting_messages
+    
+    def get_user_email_verification_status(self, email: str) -> tuple[bool, str]:
+        """
+        Check if the user's email is verified.
+        """
+        response = self.httpx_client.post(
+            self.server_endpoints.get_user_verification_status_via_email.path,
+            params={"email": email},
+        )
+
+        return response.json() or False
 
     def get_data_summary(self) -> {}:
         """
diff --git a/tabpfn_client/config.py b/tabpfn_client/config.py
index 2f05f3a..6c1d128 100644
--- a/tabpfn_client/config.py
+++ b/tabpfn_client/config.py
@@ -8,6 +8,7 @@
 
 class TabPFNConfig:
     is_initialized = None
+    user_email = None
     use_server = None
     user_auth_handler = None
     inference_handler = None
@@ -44,7 +45,7 @@ def init(use_server=True):
                 )
 
             # prompt for login / register
-            PromptAgent.prompt_and_set_token(user_auth_handler)
+            g_tabpfn_config.user_email = PromptAgent.prompt_and_set_token(user_auth_handler)
 
         # Print new greeting messages. If there are no new messages, nothing will be printed.
         PromptAgent.prompt_retrieved_greeting_messages(
diff --git a/tabpfn_client/estimator.py b/tabpfn_client/estimator.py
index 2265552..799e09e 100644
--- a/tabpfn_client/estimator.py
+++ b/tabpfn_client/estimator.py
@@ -181,6 +181,12 @@ def __init__(
         self.add_fingerprint_features = add_fingerprint_features
         self.subsample_samples = subsample_samples
 
+        # check if user is verified
+        if config.g_tabpfn_config.user_email and not config.g_tabpfn_config.user_auth_handler.get_user_email_verification_status(config.g_tabpfn_config.user_email):
+            raise RuntimeError(
+                "Dear User, your email has not been verified. Please, check your mailbox, verify your email and try again!"
+            )
+
     def fit(self, X, y):
         # assert init() is called
         if not config.g_tabpfn_config.is_initialized:
@@ -311,6 +317,12 @@ def __init__(
         self.super_bar_dist_averaging = super_bar_dist_averaging
         self.subsample_samples = subsample_samples
 
+        # check if user is verified
+        if config.g_tabpfn_config.user_email and not config.g_tabpfn_config.user_auth_handler.get_user_email_verification_status(config.g_tabpfn_config.user_email):
+            raise RuntimeError(
+                "Dear User, your email has not been verified. Please, check your mailbox, verify your email and try again!"
+            )
+
     def fit(self, X, y):
         # assert init() is called
         if not config.g_tabpfn_config.is_initialized:
diff --git a/tabpfn_client/prompt_agent.py b/tabpfn_client/prompt_agent.py
index 5b9a299..d877d73 100644
--- a/tabpfn_client/prompt_agent.py
+++ b/tabpfn_client/prompt_agent.py
@@ -55,6 +55,7 @@ def prompt_and_set_token(cls, user_auth_handler: "UserAuthenticationClient"):
             ]
         )
         choice = cls._choice_with_retries(prompt, ["1", "2"])
+        email = ""
 
         # Registration
         if choice == "1":
@@ -161,6 +162,7 @@ def prompt_and_set_token(cls, user_auth_handler: "UserAuthenticationClient"):
                     )
 
             print(cls.indent("Login successful!") + "\n")
+        return email
 
     @classmethod
     def prompt_terms_and_cond(cls) -> bool:
diff --git a/tabpfn_client/service_wrapper.py b/tabpfn_client/service_wrapper.py
index f9f4ffc..d915f23 100644
--- a/tabpfn_client/service_wrapper.py
+++ b/tabpfn_client/service_wrapper.py
@@ -58,6 +58,9 @@ def set_token_by_login(self, email: str, password: str) -> tuple[bool, str]:
         self.set_token(access_token)
         return True, message
 
+    def get_user_email_verification_status(self, email: str) -> tuple[bool, str]:
+        return self.service_client.get_user_email_verification_status(email)
+
     def try_reuse_existing_token(self) -> bool:
         if self.service_client.access_token is None:
             if not self.CACHED_TOKEN_FILE.exists():
@@ -175,7 +178,7 @@ def __init__(self, service_client=ServiceClient()):
     def fit(self, X, y) -> None:
         if not self.service_client.is_initialized:
             raise RuntimeError(
-                "Either email is not verified or Service client is not initialized. Please Verify your email and try again!"
+                "Service client is not initialized!"
             )
 
         self.last_train_set_uid = self.service_client.upload_train_set(X, y)