Mass mailing records now include their creation date in the list view and search options. This makes it easier for users to find, sort, and review mailings based on when they were created.

- Task: https://www.odoo.com/web#id=10258&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.DHpbKUaBiEGa7skb