I run Odoo 17 Community and have hit a road-block with the Marketing Email module: every campaign I send goes out with a completely blank subject line. Alongside that, some templates lose their formatting once they reach the inbox. I need an Odoo specialist who can: • trace why the subject header is not being populated in mass-mailings and restore it for both ad-hoc and automated campaigns, • correct the template rendering so the emails look exactly as they do in the Odoo editor, • leave clear, step-by-step notes so I can repeat the fix on staging and future upgrades. If the root cause touches SMTP settings, list IDs, QWeb/Jinja templates, or any recent module updates, please patch them and test thoroughly. A short call or screen-share at the end to walk me through what you changed will close the job.