Mautic is open-source marketing automation software that you can install on your own infrastructure. Its installation uses a web server, a database and a configured email delivery provider. This lets you choose the hosting environment and email transport for your marketing setup.
Self-hosting requires ongoing updates, scheduled background jobs, backups and delivery monitoring. Check the requirements of the chosen Mautic version and budget for hosting and email delivery, even though the software is open source.
Source: Product overview

