Buttondown vs Mailtrain

Buttondown has no write-up on Specifiction yet; its figures are above.

Mailtrain is a free, self-hosted newsletter application built on Node.js and MySQL or MariaDB. It manages subscriber lists, segmentation, and custom fields, and supports triggered and RSS campaign automation. Email templates include MJML-based templates, while custom reports provide reporting capabilities. Multiple users can work with granular permissions and flexible sharing, and hierarchical namespaces support organization across larger setups. Mailtrain includes Zone-MTA for mail delivery and separates trusted, sandbox, and public endpoints to help avoid XSS attacks in multi-user settings. Its Docker configuration supports LDAP authentication and CAS, with an optional API access-token setting. Mailtrain v2 is distributed under the GPL-V3.0 license and is listed at free. Deployment options include Docker Compose and direct installation on CentOS 7 or Ubuntu 18.04 LTS. Version 2 requires Node.js 14 or later and MySQL 8 or later, or MariaDB 10 or later; the recommended minimum hardware is 2 vCPU and 4096 MB RAM. Docker users should set ADMIN_PASSWORD because the default is test.