diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index db2dc9fbb26..e0bc166a1a9 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -1691,7 +1691,7 @@ class MailThread(models.AbstractModel):
                         cids_in_body.add(node.get('src').split('cid:')[1])
                     elif node.get('data-filename'):
                         names_in_body.add(node.get('data-filename'))
-                attachement_values_list = []
+            attachement_values_list = []
 
             # generate values
             for attachment in attachments: