email-delivery

Keila is an open source newsletter tool and Mailchimp alternative that allows you to easily send campaigns and create sign-up forms, with support for multiple email delivery providers.

Fully functional open source email marketing manager for creating, sending, integrating, and analyzing email campaigns and newsletters. Used in 95+ countries and available in 20 languages.

Sympa is an open source electronic mailing list manager that automates list management functions like subscriptions, moderation, and archives. Optimized for large lists with efficient message delivery.