diff --git a/addons/event/models/event_mail.py b/addons/event/models/event_mail.py
index 5f4af1c38e7..88cea87792f 100644
--- a/addons/event/models/event_mail.py
+++ b/addons/event/models/event_mail.py
@@ -288,9 +288,10 @@ class EventMailRegistration(models.Model):
                 author = self.env.user
 
             email_values = {
-                'email_from': author.email_formatted,
                 'author_id': author.id,
             }
+            if not reg_mail.scheduler_id.template_ref.email_from:
+                email_values['email_from'] = author.email_formatted
             reg_mail.scheduler_id.template_ref.send_mail(reg_mail.registration_id.id, email_values=email_values)
         todo.write({'mail_sent': True})