diff --git a/addons/account_edi/models/account_edi_document.py b/addons/account_edi/models/account_edi_document.py
index 10de7724c3d..f6d97ba869d 100644
--- a/addons/account_edi/models/account_edi_document.py
+++ b/addons/account_edi/models/account_edi_document.py
@@ -283,4 +283,8 @@ class AccountEdiDocument(models.Model):
         if not (attachment_sudo.res_model and attachment_sudo.res_id):
             # do not return system attachment not linked to a record
             return {}
+        if len(self._context.get('active_ids', [])) > 1:
+            # In mass mail mode 'attachments_ids' is removed from template values
+            # as they should not be rendered
+            return {'attachments': [(attachment_sudo.name, attachment_sudo.datas)]}
         return {'attachment_ids': attachment_sudo.ids}