NuevoMailer

NuevoMailer is a self-hosted email marketing platform you install on your own server, making it a natural fit for agencies that want full data control and zero monthly fees. The one-time license purchase lets you create unlimited brands and mailing lists without hitting subscriber caps or overage charges. You're responsible for hosting and maintenance, but you own the installation completely.

This approach appeals to agencies serving enterprise clients with data residency requirements or working in regulated industries where keeping subscriber data in-house is non-negotiable. The upfront cost and hosting responsibility mean it's better for established agencies with technical staff rather than startups. If your clients demand open-source transparency or you've already got server infrastructure, the economics work out significantly cheaper than SaaS platforms over time.