diff --git a/.env b/.env
index 1d81e62..bea11f5 100644
--- a/.env
+++ b/.env
@@ -5,7 +5,6 @@ DB_PASS=TX.)-U1!zq5Axdk4
 DB_NAME=Sondes
 AUTH_USERS=[{"user":"Michel","pass":"210462"}]
 
-
 # MQTT
 MQTT_HOST=162.19.78.131
 MQTT_USER=sondes
@@ -39,9 +38,10 @@ SMTP_SECURITY=STARTTLS
 SMTP_USER=services@domo91.fr
 SMTP_PASS='VHq3278YA#sGV*bh#mR'
 MAIL_FROM=services@domo91.fr
+MAIL_TO=services@domo91.fr
 MAIL_TO_SACLAY=robots@domo91.fr,nicolas.thibaut@bw-paris-saclay.com
 MAIL_FROM_SACLAY="DOMO91 Saclay <services@domo91.fr>"
-MAIL_TO_MEUDON=robots@domo91.fr,superviseur.restauration@parismeudonermitage.com,chef@parismeudonermitage.com
+MAIL_TO_MEUDON=robots@domo91.fr,chef@parismeudonermitage.com
 MAIL_FROM_MEUDON="DOMO91 Meudon <services@domo91.fr>"
 
 # --- Paramètres SMS ----
diff --git a/app/surveillance_releves.py b/app/surveillance_releves.py
index 461810c..d52f074 100644
--- a/app/surveillance_releves.py
+++ b/app/surveillance_releves.py
@@ -1,39 +1,31 @@
 #!/home/debian/Gestion_sondes/myenv/bin/python3
+# Surveillance de l'arrivée des relevés (par table/site) + SMS d'alerte / retour à la normale
 
 from datetime import datetime, timedelta
 from dotenv import load_dotenv
 import os
-import utils_db
 import logging
-from utils_sms import envoyer_sms
 
-# Dossier Logs
+import mysql.connector  # important pour cibler les exceptions MySQL
+
+import utils_db
+from utils_mail import envoyer_mail
+
+# -------------------- LOGS --------------------
 LOG_DIR = '/home/debian/Gestion_sondes/Logs'
 os.makedirs(LOG_DIR, exist_ok=True)
 
-# Fichier de log (nommé par date)
 log_filename = os.path.join(LOG_DIR, datetime.now().strftime("surveillance_%Y-%m-%d.log"))
-
 logging.basicConfig(
     level=logging.INFO,
     format='%(asctime)s - %(levelname)s - %(message)s',
-    handlers=[
-        logging.FileHandler(log_filename),
-        logging.StreamHandler()  # Affiche aussi les logs dans la console
-    ]
+    handlers=[logging.FileHandler(log_filename), logging.StreamHandler()]
 )
 
-# Charger .env
+# -------------------- ENV --------------------
 load_dotenv('/home/debian/Gestion_sondes/.env')
 
-# OVH SMS
-APP_KEY = os.getenv('OVH_APPLICATION_KEY')
-APP_SECRET = os.getenv('OVH_APPLICATION_SECRET')
-CONSUMER_KEY = os.getenv('OVH_CONSUMER_KEY')
-SERVICE_NAME = os.getenv('OVH_SMS_SERVICE')
-SMS_RECEIVER = os.getenv('SMS_RECEIVER')
-SMS_SENDER = os.getenv('OVH_SMS_SENDER')
-
+# -------------------- PARAMETRES --------------------
 tables = ['Saclay', 'Meudon']
 DELAI_MINUTES = 15
 RAPPEL_HEURES = 6
@@ -41,61 +33,128 @@ RAPPEL_HEURES = 6
 STATE_DIR = '/tmp/surveillance_states'
 os.makedirs(STATE_DIR, exist_ok=True)
 
-def should_send_alert(site):
-    state_file = os.path.join(STATE_DIR, f'{site}.state')
+TABLES_SET = set(tables)  # whitelist simple
+
+def _state_file(site: str) -> str:
+    return os.path.join(STATE_DIR, f'{site}.state')
+
+def should_send_alert(site: str) -> bool:
+    """
+    Retourne True si on doit envoyer une alerte maintenant (première fois ou rappel).
+    Met à jour le fichier d'état en cas d'envoi.
+    """
+    sf = _state_file(site)
     now = datetime.now()
-    if not os.path.exists(state_file):
-        with open(state_file, 'w') as f:
-            f.write(now.isoformat())
+
+    if not os.path.exists(sf):
+        # première alerte
+        try:
+            with open(sf, 'w') as f:
+                f.write(now.isoformat())
+        except OSError as e:
+            logging.warning(f"Impossible d'écrire l'état {sf} : {e} (on alerte quand même).")
         return True
-    with open(state_file, 'r') as f:
-        last_alert = datetime.fromisoformat(f.read().strip())
+
+    try:
+        with open(sf, 'r') as f:
+            raw = f.read().strip()
+        last_alert = datetime.fromisoformat(raw)
+    except (OSError, ValueError) as e:
+        # état illisible/corrompu -> on réinitialise et on alerte
+        logging.warning(f"Etat corrompu pour {site} ({sf}) : {e}. Réinitialisation.")
+        try:
+            with open(sf, 'w') as f:
+                f.write(now.isoformat())
+        except OSError as e2:
+            logging.warning(f"Impossible de réécrire l'état {sf} : {e2}")
+        return True
+
     if now - last_alert >= timedelta(hours=RAPPEL_HEURES):
-        with open(state_file, 'w') as f:
-            f.write(now.isoformat())
+        try:
+            with open(sf, 'w') as f:
+                f.write(now.isoformat())
+        except OSError as e:
+            logging.warning(f"Impossible de mettre à jour l'état {sf} : {e} (on alerte quand même).")
         return True
+
     return False
 
-def clear_state(site):
-    state_file = os.path.join(STATE_DIR, f'{site}.state')
-    if os.path.exists(state_file):
-        os.remove(state_file)
+def clear_state(site: str) -> None:
+    sf = _state_file(site)
+    try:
+        if os.path.exists(sf):
+            os.remove(sf)
+    except OSError as e:
+        logging.warning(f"Impossible de supprimer l'état {sf} : {e}")
 
 def main():
-    cnx = utils_db.connect_to_mysql()  # ← appel via db_utils
-    cursor = cnx.cursor()
-
-    now = datetime.now()
-    limite = now - timedelta(minutes=DELAI_MINUTES)
     problemes = []
+    limite = datetime.now() - timedelta(minutes=DELAI_MINUTES)
 
-    for table in tables:
-        cursor.execute(f"SELECT MAX(Date) FROM {table}")
-        result = cursor.fetchone()
-        last_update = result[0]
+    # 1) Connexion MySQL (une seule fois)
+    try:
+        cnx = utils_db.connect_to_mysql()
+        cursor = cnx.cursor()
+    except mysql.connector.Error as e:
+        logging.error(f"MySQL KO : {e}")
+        envoyer_mail("⚠️ ALERTE : Base MySQL inaccessible (surveillance impossible).")
+        return
 
-        if not last_update or last_update < limite:
-            if should_send_alert(table):
-                problemes.append(f"{table} (dernier relevé : {last_update})")
+    # 2) Surveillance par table (try SQL à l'intérieur de la boucle)
+    try:
+        for table in tables:
+            if table not in TABLES_SET:
+                logging.warning(f"Table ignorée (non whitelistée) : {table}")
+                continue
+
+            # 2a) Lecture de la dernière date (erreurs SQL gérées finement)
+            try:
+                cursor.execute(f"SELECT MAX(Date) FROM `{table}`")
+                (last_update,) = cursor.fetchone()
+            except mysql.connector.Error as e:
+                logging.error(f"Erreur SQL sur {table} : {e}")
+                # Vous pouvez décider ici si vous voulez un SMS ou seulement un log.
+                if should_send_alert(table):
+                    envoyer_mail(f"⚠️ ALERTE : erreur SQL sur {table} (voir logs).")
+                continue
+
+            # 2b) Logique métier (hors try SQL)
+            if (last_update is None) or (last_update < limite):
+                if should_send_alert(table):
+                    problemes.append(f"{table} (dernier relevé : {last_update})")
+                    logging.warning(f"⚠️ {table} en défaut (dernier relevé : {last_update})")
+                else:
+                    logging.info(f"⏳ {table} déjà signalé, rappel dans {RAPPEL_HEURES}h.")
             else:
-                logging.info(f"⏳ Problème déjà signalé pour {table}, attente du délai de rappel.")
-        else:
-            if os.path.exists(os.path.join(STATE_DIR, f'{table}.state')):
-                message = f"✅ {table} : relevés à nouveau reçus. Situation normale."
-                envoyer_sms(message)
-                clear_state(table)
-                logging.info(f"📩 SMS de retour à la normale envoyé pour {table}.")
-            else:
-                logging.info(f"✅ {table} OK (dernier relevé : {last_update})")
+                # Retour à la normale uniquement si on était en défaut (state présent)
+                if os.path.exists(_state_file(table)):
+                    message = f"✅ {table} : relevés à nouveau reçus (dernier : {last_update}). Situation normale."
+                    envoyer_mail(
+                        f"✅ OK : {table} relevés reçus",
+                        message
+                    )
+                    clear_state(table)
+                    logging.info(f"📩 Retour à la normale envoyé pour {table}.")
+                else:
+                    logging.info(f"✅ {table} OK (dernier relevé : {last_update})")
 
-    cursor.close()
-    cnx.close()
+    finally:
+        # 3) Nettoyage MySQL
+        try:
+            cursor.close()
+            cnx.close()
+        except mysql.connector.Error:
+            pass
 
+    # 4) Alerte groupée si besoin
     if problemes:
-        message = "⚠️ ALERTE : pas de relevés depuis >15min :\n" + "\n".join(problemes)
-        envoyer_sms(message)
+        message = f"⚠️ ALERTE : pas de relevés depuis >{DELAI_MINUTES}min :\n" + "\n".join(problemes)
+        envoyer_mail(
+            f"⚠️ ALERTE : absence de relevés > {DELAI_MINUTES} min",
+            message
+        )
     else:
-        logging.info("👍 Tout est OK, aucun SMS envoyé.")
+        logging.info("👍 Tout est OK, aucun Mail envoyé.")
 
 if __name__ == "__main__":
     main()
diff --git a/app/utils_db.py b/app/utils_db.py
new file mode 100644
index 0000000..d355df8
--- /dev/null
+++ b/app/utils_db.py
@@ -0,0 +1,73 @@
+import mysql.connector
+from dotenv import load_dotenv
+import os
+
+load_dotenv()
+
+
+def connect_to_mysql():
+    return mysql.connector.connect(
+        host=os.getenv("DB_HOST"),
+        user=os.getenv("DB_USER"),
+        password=os.getenv("DB_PASS"),
+        database=os.getenv("DB_NAME")
+    )
+
+
+def get_latest_chaufferie():
+    conn = connect_to_mysql()
+    cursor = conn.cursor(dictionary=True)
+    query = """
+            SELECT Sonde, Temperature, Date, Topic
+            FROM Sondes.Chaufferie
+            WHERE Date >= NOW() - INTERVAL 5 MINUTE
+            ORDER BY Date DESC \
+            """
+    cursor.execute(query)
+    result = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return result
+
+
+def get_history_by_sonde(sonde):
+    conn = connect_to_mysql()
+    cursor = conn.cursor(dictionary=True)
+    query = """
+            SELECT Sonde, Temperature, Date
+            FROM Sondes.Chaufferie
+            WHERE Sonde = %s
+              AND Date >= NOW() - INTERVAL 1 DAY \
+
+            """
+    cursor.execute(query, (sonde,))
+    result = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return result
+
+
+def lire_alertes_sondes():
+    conn = connect_to_mysql()
+    cursor = conn.cursor(dictionary=True)
+    query = """
+            SELECT Id, Sonde, Debut_defaut, Etat
+            FROM Sondes.Alertes_Chaufferie
+            WHERE Etat != 'Acquitté'
+            ORDER BY Debut_defaut DESC \
+            """
+    cursor.execute(query)
+    result = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return result
+
+
+def acquitter_alerte(id_alerte):
+    conn = connect_to_mysql()
+    cursor = conn.cursor()
+    query = "UPDATE Sondes.Alertes_Chaufferie SET Etat = 'Acquitté' WHERE Id = %s"
+    cursor.execute(query, (id_alerte,))
+    conn.commit()
+    cursor.close()
+    conn.close()
diff --git a/app/utils_mail.py b/app/utils_mail.py
new file mode 100644
index 0000000..41e6fd1
--- /dev/null
+++ b/app/utils_mail.py
@@ -0,0 +1,45 @@
+# /home/debian/Gestion_sondes/utils_mail.py
+import os
+import smtplib
+import logging
+from email.mime.text import MIMEText
+from dotenv import load_dotenv
+
+load_dotenv('/home/debian/Gestion_sondes/.env')
+
+SMTP_HOST = os.getenv("SMTP_HOST", "smtp.mail.ovh.net")
+SMTP_PORT = int(os.getenv("SMTP_PORT", "465"))
+
+SMTP_LOGIN = os.getenv("SMTP_LOGIN")       # ex: services@domo91.fr
+SMTP_PASSWORD = os.getenv("SMTP_PASSWORD") # mot de passe OVH
+MAIL_FROM = os.getenv("MAIL_FROM", SMTP_LOGIN)
+MAIL_TO = os.getenv("MAIL_TO")             # ex: services@domo91.fr
+
+def envoyer_mail(sujet: str, contenu: str, destinataires=None) -> None:
+    """
+    Envoi email via OVH SMTP SSL 465 (process identique à supervisor_watchdog.py).
+    destinataires: str unique ou liste; si None => MAIL_TO depuis .env
+    """
+    if destinataires is None:
+        if not MAIL_TO:
+            raise ValueError("MAIL_TO manquant dans le .env")
+        destinataires = [a.strip() for a in MAIL_TO.split(",") if a.strip()]
+    elif isinstance(destinataires, str):
+        destinataires = [destinataires]
+
+    if not SMTP_LOGIN or not SMTP_PASSWORD:
+        raise ValueError("SMTP_LOGIN / SMTP_PASSWORD manquants dans le .env")
+
+    msg = MIMEText(contenu)
+    msg["Subject"] = sujet
+    msg["From"] = MAIL_FROM
+    msg["To"] = ", ".join(destinataires)
+
+    try:
+        with smtplib.SMTP_SSL(SMTP_HOST, SMTP_PORT) as server:
+            server.login(SMTP_LOGIN, SMTP_PASSWORD)
+            server.sendmail(MAIL_FROM, destinataires, msg.as_string())
+        logging.info("📧 Mail envoyé: %s -> %s", sujet, destinataires)
+    except Exception as e:
+        logging.error("Erreur envoi mail: %s", e)
+        raise