ActiveCampaign
Email marketing and CRM platform for customer experience automation
Open-Source Projects
Discover top open-source software, updated regularly with real-world adoption signals.
Discover top open-source software, updated regularly with real-world adoption signals.
Self-hosted email marketing and mail server platform
Open-source mail server and email marketing solution for newsletters, campaigns, and transactional emails. Self-hosted with advanced analytics, unlimited sending, and full data control.
BillionMail is a self-hosted mail server and email marketing platform that gives businesses and developers complete control over their email operations. Built for organizations tired of expensive SaaS platforms and vendor lock-in, it combines a full-featured mail server (Postfix, Dovecot, Rspamd) with campaign management tools for newsletters, promotional emails, and transactional messaging.
Installation takes approximately 8 minutes via shell script or Docker. The platform includes domain verification workflows, automatic SSL provisioning, and integrated RoundCube webmail. Advanced analytics track delivery rates, opens, and click-throughs while customizable templates streamline campaign creation. Customer management features and list segmentation with tags enable targeted messaging at any scale.
As a self-hosted solution, BillionMail ensures your subscriber data and email content remain on your infrastructure. No third-party tracking, no per-email pricing, and no artificial sending limits. The AGPL-3.0 license guarantees transparency and community ownership. Ideal for developers, marketing teams, and organizations requiring email sovereignty alongside professional campaign capabilities.
When teams consider BillionMail, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
SaaS Transactional Email
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Newsletter Publishing
Content creators distribute weekly newsletters to subscriber lists with open rate tracking and template reuse
E-commerce Campaign Management
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Agency Client Email Services
Marketing agencies deploy isolated instances per client with branded domains and campaign reporting
The installation script completes in approximately 8 minutes from clone to sending your first email, including mail server configuration and web interface setup.
BillionMail integrates Postfix (SMTP), Dovecot (IMAP/POP3), Rspamd (spam filtering), and RoundCube webmail as a complete mail server stack.
No artificial limits exist in the software. Actual volume depends on your server resources, IP reputation, and ISP sending policies.
Yes, you can add multiple sending domains with independent DNS verification and SSL certificates through the domain management interface.
All subscriber data, email content, and analytics remain on your self-hosted infrastructure with no third-party access or external tracking.
Project at a glance
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