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BillionMail is an open-source mail server and email marketing platform for sending newsletters, promotional emails, and transactional messages.

Sympa is an electronic mailing list manager that automates subscription, moderation, archive management, and message delivery for mailing lists.

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

listmonk is a self-hosted newsletter and mailing list manager packaged as a single binary.

Open source marketing automation software for creating and managing integrated marketing campaigns.

phpList is an open source email marketing manager for creating, sending, integrating, and analysing email campaigns and newsletters.

Keila is an open source newsletter tool for sending campaigns and creating sign-up forms.

Plunk is an open-source email platform for sending transactional emails, campaigns, and automations from self-hosted applications.

A free, self-hosted CRM built with Python and Django for managing leads, deals, contacts, tasks, email campaigns, and analytics.

Dittofeed is an open-source omni-channel customer engagement platform for sending broadcasts and automated user journeys across channels like email, SMS, WhatsApp, Slack, and mobile push.

A Django-based blogging platform with subdomain-based user blogs, publishing tools, and deployment support.

A web application for managing CSA, ACP, and Solawi community agriculture organizations.