The Mass Mailing module was reorganized and updated to Odoo's newer internal framework, making it easier to maintain and evolve. The change also ensures unsubscribe links are correctly added to outgoing campaign emails, supporting better compliance and recipient experience.

<b>TASK:<b> https://www.odoo.com/web#id=13385&view_type=form&model=project.task&action=327
<b>PAD:</b> https://pad.odoo.com/p/r.AAcxdoY19shFk0xW