Mautic

Mautic is a marketing automation platform that stores contacts and companies, tracks their activity on your site and in your emails, and runs campaigns that respond to how people behave. It includes a contact database with segmentation, an email builder, landing pages and forms, campaign workflows that score and nurture leads, and tracking pixels that feed behaviour back into the contact record.

Marketing and sales teams use it to send newsletters, run drip sequences and hand scored leads to a sales team or CRM.

Self-hosted, the contact data and behavioural history stay on infrastructure you own, the cost does not scale with the size of your mailing list, and a database dump gives you a complete backup of every campaign and contact.