Hi,

You're encountering errors when sending email marketing campaigns to 4,500 addresses in Odoo, even with a separate mail server, and you need to track who receives the emails. This is likely due to sending limits, rate limiting, bounce handling issues, mail server configuration problems, or Odoo's email settings.

To resolve this, optimize your mail server configuration by ensuring SPF, DKIM, and DMARC records are properly set up. Adjust Odoo's email settings to send emails in batches with delays to avoid exceeding sending limits. Implement proper bounce handling to manage invalid email addresses. Consider using a dedicated email marketing service like Mailchimp or Sendinblue, integrating it with Odoo. Track email sending in Odoo using email statistics, and consider custom development for more detailed tracking. Start by checking your mail server's sending limits, reviewing its configuration, adjusting Odoo's batch sending settings, and monitoring email statistics. If problems persist, a dedicated email marketing service might be the best solution.

Reference:-

Hope it helps