Earlier PR improved ACLs in Discuss [1]. Route `/mail/load_message_failures` was made in non-sudo as to take ACLs into account, so that we don't get mail failures that we don't have access [2] However, checking ACLs on `mail.message` from `search` on `mail.notification` is very slow [3], to the point where the RPC takes minutes and results in a `memoryerror`. Ideally we should have non-sudo and make checking ACLs more performant. As a quick fix in a stable version, we revert to using `sudo`, which results in same quick results as before. [1]: https://github.com/odoo/odoo/pull/138330 [2]: https://github.com/odoo/odoo/pull/138330/files#diff-6be51f3695e69474a19cf6857370c8bb9b529a15d568952258cec9a0ae519fc4R23 [3]: https://github.com/odoo/odoo/blob/17.0/addons/mail/models/res_partner.py#L251 closes odoo/odoo#146184 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>