Mail-related configuration data has been moved into dedicated files for Helpdesk, Appraisals, and Timesheets. This makes future maintenance easier and should not change how users experience these apps.

Task: https://www.odoo.com/web#id=60962&view_type=form&model=project.task&action=333&active_id=965&menu_id=4720

Related to https://github.com/odoo/odoo/pull/23232