Billionmail/BillionMail ? reverse-engineered prompt

I want to build a self-hosted email marketing platform, basically an open-source alternative to something like Mailchimp, so I can avoid recurring fees and have full control over my customer data.

The system needs to be a complete, all-in-one solution. It should include its own mail server stack (SMTP, etc.) so I don't need a separate service for sending. The core of the app will be a web dashboard where I can manage my email campaigns, import and tag contact lists, and create nice-looking emails with customizable templates.

A key feature is analytics. I need to be able to track performance for each campaign, like open rates, click-throughs, and delivery status. It should also include a webmail client like RoundCube so I can manage mailboxes. Please set this all up using Docker and Docker Compose so it's easy to deploy on a server.