diff --git a/addons/mail/models/mail_mail.py b/addons/mail/models/mail_mail.py
index b03ca0a37b1d7..f3bbc49411f28 100644
--- a/addons/mail/models/mail_mail.py
+++ b/addons/mail/models/mail_mail.py
@@ -333,6 +333,7 @@ def _send(self, auto_commit=False, raise_exception=False, smtp_session=None):
                     'state': 'exception',
                     'failure_reason': _('Error without exception. Probably due do sending an email without computed recipients.'),
                 })
+                mail.flush()
                 # Update notification in a transient exception state to avoid concurrent
                 # update in case an email bounces while sending all emails related to current
                 # mail record.