diff --git a/addons/mail/mail_followers.py b/addons/mail/mail_followers.py
index e8cf2648f29..94e1f488ef7 100644
--- a/addons/mail/mail_followers.py
+++ b/addons/mail/mail_followers.py
@@ -161,9 +161,10 @@ class mail_notification(osv.Model):
         if signature:
             body_html = tools.append_content_to_html(body_html, signature)
 
+        partner_email = [partner.email for partner in msg.partner_ids] if msg.partner_ids else []
         mail_values = {
             'mail_message_id': msg.id,
-            'email_to': [],
+            'email_to': partner_email,
             'auto_delete': True,
             'body_html': body_html,
             'state': 'outgoing',