diff --git a/pyAmakCore/classes/communicating_agent.py b/pyAmakCore/classes/communicating_agent.py
index be6d0f017e1311317746d4b70d0dae89dce28166..19f8a8354ad24d589372598e2d3de0b5c80785e4 100644
--- a/pyAmakCore/classes/communicating_agent.py
+++ b/pyAmakCore/classes/communicating_agent.py
@@ -17,10 +17,11 @@ class Mail:
     Class message
     """
 
-    def __init__(self, id_sender: int, id_receiver: int, message: Any) -> None:
+    def __init__(self, id_sender: int, id_receiver: int, message: Any, sending_date: int) -> None:
         self.__id_sender = id_sender
         self.__id_receiver = id_receiver
         self.__message = message
+        self.__sending_date = sending_date
 
     def get_id_sender(self):
         """
@@ -40,6 +41,12 @@ class Mail:
         """
         return self.__message
 
+    def get_sending_date(self):
+        """
+        return sending_date
+        """
+        return self.__sending_date
+
 
 class Mailbox:
     """
@@ -72,7 +79,7 @@ class Mailbox:
         """
         this method is called to send a message
         """
-        mail = Mail(self.__owner_id, id_receiver, message)
+        mail = Mail(self.__owner_id, id_receiver, message, self.__amas.get_cycle())
 
         for agent in self.__amas.get_agents():
             if agent.get_id() == id_receiver:
diff --git a/pyAmakCore/tests/test_communicating_agent/test_mail.py b/pyAmakCore/tests/test_communicating_agent/test_mail.py
index 9f875811be0ec0334166e2a871e3b480a7f1ffae..444505df65d027c74ab77e81a8d50fa82d365a2f 100644
--- a/pyAmakCore/tests/test_communicating_agent/test_mail.py
+++ b/pyAmakCore/tests/test_communicating_agent/test_mail.py
@@ -15,17 +15,18 @@ class TestMail(TestCase):
         """
         Test mail init
         """
-        mail = Mail(1, 5, None)
+        mail = Mail(1, 5, None, 0)
 
         self.assertEqual(mail.get_id_sender(), 1)
         self.assertEqual(mail.get_id_receiver(), 5)
         self.assertEqual(mail.get_message(), None)
+        self.assertEqual(mail.get_sending_date(), 0)
 
-        mail = Mail(255, 0, "test")
+        mail = Mail(255, 0, "test", 12)
         self.assertEqual(mail.get_id_sender(), 255)
         self.assertEqual(mail.get_id_receiver(), 0)
         self.assertEqual(mail.get_message(), "test")
-
+        self.assertEqual(mail.get_sending_date(), 12)
 
 if __name__ == '__main__':
     main()