diff --git a/CHANGES.rst b/CHANGES.rst
index 5e0b11d1..49eefceb 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -17,9 +17,14 @@ Changelog
   [mamico]
 
 - Remove Contributor from the package permissions map
+  [folix-01]
+
 - Add configurable simultaneous bookings limit for the same user.
   [folix-01]
 
+- Remove "immediate=True" from mailhost send in send_email_to_managers because can cause multiple sends when there are conflicts.
+  [cekk]
+
 2.0.0 (2023-09-12)
 ------------------
 
diff --git a/src/redturtle/prenotazioni/events/prenotazione.py b/src/redturtle/prenotazioni/events/prenotazione.py
index cd66c5fe..b74345de 100644
--- a/src/redturtle/prenotazioni/events/prenotazione.py
+++ b/src/redturtle/prenotazioni/events/prenotazione.py
@@ -181,7 +181,6 @@ def send_email_to_managers(booking, event):
                     subject=subject,
                     charset="utf-8",
                     msg_type="text/html",
-                    immediate=True,
                 )