What is BillionMail used for?

BillionMail is a self-hosted mail server, newsletter, and email marketing platform built on Postfix, Dovecot, and Rspamd, without monthly sending fees. It is a good fit for sending newsletters without per-subscriber fees and running a private mail server for a small business.

Is BillionMail open source?

Yes. BillionMail is open source under the AGPL-3.0 licence. Its source code is on GitHub at Billionmail/BillionMail and is written mainly in Go.

Yes. BillionMail is open source, so the software itself is free to use.

Can I self-host BillionMail?

Yes. BillionMail can be self-hosted on your own server or infrastructure; there is no official hosted version.

What is BillionMail an alternative to?

BillionMail is an open-source alternative to Mailchimp, Brevo, MailerLite and SendGrid. Other open-source alternatives to Mailchimp include Notifuse, Listmonk and Mautic.

Is BillionMail actively maintained?

The most recent commit to BillionMail was on 11 June 2026, and the latest release is v4.9, published on 11 December 2025. The project has 16k stars on GitHub.

BillionMail: open-source alternative to Mailchimp, Brevo

About BillionMail

BillionMail is an open-source platform that combines a mail server with newsletter and email marketing tools. It is meant for businesses and individuals who want to send newsletters, promotional email, or transactional messages themselves instead of paying monthly fees to a marketing service. It is written in Go and released under the AGPL-3.0 license.

Under the hood it relies on established components, with topics naming Postfix, Dovecot, Rspamd, and SMTP. The product adds campaign creation and sending, advanced analytics, and customer management on top, and the README promotes a quick three-step setup. Documentation is available in several languages and there is a Discord community.

Running your own mail infrastructure involves deliverability work such as DNS records and sender reputation, which the README does not detail. It suits developers, small businesses, and communities that want control over their email lists and sending, and that are willing to host and maintain the server.

Key features

Self-hosted mail server
Newsletter and campaign sending
Analytics for email campaigns
Customer and list management
Built on Postfix, Dovecot, and Rspamd
Transactional email support

Good fit for

→Sending newsletters without per-subscriber fees
→Running a private mail server for a small business

Built with: Go
Tags: email-marketing; mail-server; newsletter; smtp; self-hosted; postfix; dovecot; go

BillionMail: questions and answers

What is BillionMail used for?: BillionMail is a self-hosted mail server, newsletter, and email marketing platform built on Postfix, Dovecot, and Rspamd, without monthly sending fees. It is a good fit for sending newsletters without per-subscriber fees and running a private mail server for a small business.
Is BillionMail open source?: Yes. BillionMail is open source under the AGPL-3.0 licence. Its source code is on GitHub at Billionmail/BillionMail and is written mainly in Go.
Is BillionMail free?: Yes. BillionMail is open source, so the software itself is free to use.
Can I self-host BillionMail?: Yes. BillionMail can be self-hosted on your own server or infrastructure; there is no official hosted version.
What is BillionMail an alternative to?: BillionMail is an open-source alternative to Mailchimp, Brevo, MailerLite and SendGrid. Other open-source alternatives to Mailchimp include Notifuse, Listmonk and Mautic.
Is BillionMail actively maintained?: The most recent commit to BillionMail was on 11 June 2026, and the latest release is v4.9, published on 11 December 2025. The project has 16k stars on GitHub.