Sometime odoo users want to have usual "Sent" mail box.
To implement it I've added new computed field:
self.sent = len(self.notified_partner_ids) > 1 \ or len(self.notified_partner_ids)==1 \ and self.notified_partner_ids.id != self.author_id.id
This field is need to filter out some messages (notifications) which don't have recepients.
This menu shows messages in threads (like in other menus), but shows only sent messages: Repository: https://github.com/yelizariev/addons-yelizariev/tree/8.0/mail\_sent