phpList

phpList is open source email marketing software for creating, sending, integrating, and analyzing email campaigns and newsletters. It manages subscriber lists, campaign delivery, and reporting in one place.

It includes analytics, segmentation, content personalization, bounce processing, and a plugin-based architecture with multiple APIs. Delivery features cover message-queue management, campaign scheduling, Amazon SES support, domain-based throttling, RSS feed campaigns, email attachments, and CSV and Excel import and export. Both web and command-line interfaces are available.

phpList can be self-hosted or used as a hosted account. It is available in 20 languages, used in 95 countries, and licensed under AGPLv3. The project also provides a demo instance plus themes and translations for the admin interface.